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Articles  |   February 2011
Clinical Efficacy of GLP-1 Agonists and Their Place in the Diabetes Treatment Algorithm
Jeff Unger, MD
Author Notes
  • Address correspondence to Jeff Unger, MD, Associate Director of Metabolic Studies, Catalina Research Institute, 12598 Central Ave, Chino, CA 91750-3502. E-mail: jungermd@aol.com 
Article Information
Endocrinology / Diabetes
Articles   |   February 2011
Clinical Efficacy of GLP-1 Agonists and Their Place in the Diabetes Treatment Algorithm
The Journal of the American Osteopathic Association, February 2011, Vol. 111, eS2-eS9. doi:
The Journal of the American Osteopathic Association, February 2011, Vol. 111, eS2-eS9. doi:
Abstract

Incretin-based therapies (subcutaneously administered glucagon-like peptide-1 [GLP-1] agonists and oral dipeptidyl peptidase-4 inhibitors) represent a new mechanism of action with which to target the adverse effects of type 2 diabetes mellitus. Both classes of incretins are excellent choices for patients who have jobs that do not permit use of insulin therapy, who have hypoglycemic unawareness, or for whom hypoglycemia is an especially worrisome potential adverse effect. Glucagon-like peptide-1 agonists are an attractive choice for patients in whom promotion of weight loss is a major consideration and the glycated hemoglobin level is moderately elevated (<8.0%) (ie, insulin is not required). Short-acting exenatide has been available since 2005 and is administered twice a day before meals. Liraglutide is the first of the long-acting GLP-1 agonists to be approved in the United States and is administered once a day. The most common adverse effects of GLP-1 agonists are those related to the gastrointestinal system. Both exenatide and liraglutide are associated with weight loss when used as monotherapy or as part of combination-therapy strategies. Glucagon-like peptide-1 agonists also have beneficial effects on cardiovascular risk factors such as blood pressure and lipids.

Understanding the features, benefits, and limitations of incretin-based therapies (glucagon-like peptide-1 [GLP-1] agonists and dipeptidyl peptidase-4 [DPP-4] inhibitors) has become important in light of recent trends in treatment recommendations for patients with type 2 diabetes mellitus.1-3 Incretin-based therapies represent a new mechanism of action, which targets the adverse effects of type 2 diabetes. They may be used in a complementary fashion with more traditional agents as part of combination treatment strategies. Both classes of incretins are excellent choices for patients who have jobs that do not permit use of insulin therapy, who have hypoglycemic unawareness, or for whom hypoglycemia is an especially worrisome potential side effect. 
The focus of this article is to review the actions and appropriate place in therapy for the available GLP-1 agonists, exenatide and liraglutide. A brief review of current treatment goals and recommendations for patients with type 2 diabetes is included. 
Individualizing Therapy and Tailoring Treatment Goals
Each patient with diabetes should be approached comprehensively, based on the patient's unique medical history and risk factors, behaviors, and ethnocultural background and environment. 
The results of the Diabetes Control and Complications Trial,4 the United Kingdom Prospective Diabetes Study,5 and the Kumamoto study6 helped to establish glycemic goals of therapy for patients with type 2 diabetes. Since then, the Action to Control Cardiovascular Risk in Diabetes (ACCORD) trial,7 the Action in Diabetes and Vascular Disease: Preterax and Diamicron Modified Release Controlled Evaluation (ADVANCE) trial,8 and Veterans Affairs Diabetes Trial (VADT),9 in which the goals for glycated hemoglobin (HbA1c) were much more aggressive (<6% in ACCORD and VADT; ≤6.5% in ADVANCE), demonstrated that overly aggressive glucose reduction can result in adverse outcomes. The ACCORD trial was halted early due to an increased death rate for patients who underwent intensive glycemic control. In this study, hypoglycemia was 3 times more common in the intensive group. The results of ADVANCE and the VADT indicated no increase in death but no cardiovascular benefit either. 
Glucose targets should be individualized and take into account the patient's age, duration of disease, presence or absence of microvascular complications, presence or absence of macrovascular disease (including risk factors for cardiovascular disease [CVD]), and risk for severe hypo-glycemia. The general target of HbA1c levels for patients with type 2 diabetes remains less than 7%. Fasting plasma glucose (FPG) targets should be between 90 mg/dL and 130 mg/dL. For patients not at target HbA1c goals (despite having FPG levels at goal), a 2-hour postprandial glucose (PPG) goal of less than 180 mg/dL is recommended.10 
In older individuals with established disease of many years' duration and evidence of CVD (or risk factors for CVD), a more relaxed approach toward glycemic control can be considered (HbA1c ≥7%).11 The evidence suggests that the clinical course of established CVD is not readily altered by strict glycemic control, although the progression of some microvascular complications may be retarded.7-9 Patients recently diagnosed as having type 2 diabetes who do not have established atherosclerotic disease may receive cardiovascular benefit from more intensive glycemic control, bringing HbA1c levels closer to normal (ie, 6%).11 
For all patients with type 2 diabetes, CVD risk reduction is important. For lipids, the primary goal is to reduce low-density lipoprotein cholesterol (LDL-C) to less than 100 mg/dL in patients without coronary heart disease and less than 70 mg/dL in patients with CHD. Blood pressure goals for most patients with diabetes are less than 130/80 mm Hg.10 Modest weight loss (5%-10% of body weight) provides benefit in improving hyperglycemia, dyslipidemia, and hypertension.12 A summary of these recommendations is provided in the Table. 
Table.
Treatment Goals for Patients With Type 2 Diabetes
Parameter
Treatment Goal
▪ Glucose
□ Glycated hemoglobin, %<7% for most; closer to normal for healthy; relaxed for those with limited life expectancy (individualize based on age, comorbidities, and duration of disease)
□ Fasting plasma glucose, mg/dL90-130
□ 2-hour postprandial glucose, mg/dL<180
▪ Lipids, mg/dL
□ Low-density lipoprotein cholesterol≤70 highest risk (established coronary artery disease); <100 high risk plus 2 risk factors*
□ Non-high-density lipoprotein cholesterol<100 highest risk; <130 high risk
□ Apolipoprotein B levels<80 highest risk; <90 high risk
□ High-density lipoprotein>40 in men; >50 in women
□ Triglycerides<150
▪ Blood Pressure, mm Hg
□ Systolic<130
□ Diastolic<80
▪ Weight
□ Weight loss
 Reduce by at least 5%-10%; avoid weight regain
 *Risk factors are cigarette smoking; hypertension (blood pressure ≥140/90 mm Hg or on antihypertensive medication); low high-density lipoprotein cholesterol (<40 mg/dL); family history of premature congestive heart failure; and age (men, ≥45 y; women, ≥55 y).
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Table.
Treatment Goals for Patients With Type 2 Diabetes
Parameter
Treatment Goal
▪ Glucose
□ Glycated hemoglobin, %<7% for most; closer to normal for healthy; relaxed for those with limited life expectancy (individualize based on age, comorbidities, and duration of disease)
□ Fasting plasma glucose, mg/dL90-130
□ 2-hour postprandial glucose, mg/dL<180
▪ Lipids, mg/dL
□ Low-density lipoprotein cholesterol≤70 highest risk (established coronary artery disease); <100 high risk plus 2 risk factors*
□ Non-high-density lipoprotein cholesterol<100 highest risk; <130 high risk
□ Apolipoprotein B levels<80 highest risk; <90 high risk
□ High-density lipoprotein>40 in men; >50 in women
□ Triglycerides<150
▪ Blood Pressure, mm Hg
□ Systolic<130
□ Diastolic<80
▪ Weight
□ Weight loss
 Reduce by at least 5%-10%; avoid weight regain
 *Risk factors are cigarette smoking; hypertension (blood pressure ≥140/90 mm Hg or on antihypertensive medication); low high-density lipoprotein cholesterol (<40 mg/dL); family history of premature congestive heart failure; and age (men, ≥45 y; women, ≥55 y).
×
Treatment Approaches
Medical nutrition therapy continues to be the cornerstone of efforts to improve outcomes for patients with type 2 diabetes. Ongoing counseling with a registered dietitian and an individualized meal plan may help guide patients toward achieving their goals. Physicians should encourage moderate calorie restriction and carbohydrate intake along with a reduction in saturated fat and an increase in fiber intake. A program of regular moderate-intensity physical activity for 30 to 60 minutes daily, at least 5 days weekly, is also recommended.10 
Recognizing that lifestyle interventions may not be durable enough for patients to achieve or maintain their HbA1c goals, concurrent treatment with metformin is recommended by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD).3 Levels of HbA1c above 7% are a “call to action” to add on to or change therapy to achieve desired HbA1c levels. In such cases, the ADA/EASD treatment algorithm (Figure 1) goes on to recommend the rapid transition to combination therapy (ie, addition of sulfonylureas, insulin, thiazolidinediones, or GLP-1 agonists) when HbA1c levels of less than 7% are not achieved or sustained.3 Glucagon-like peptide-1 agonists are suggested as an alternative to sulfonylureas or insulin as add-on therapy to metformin. The ADA/EASD consensus statement emphasizes using agents that are “well validated” through extensive use and considering the degree to which those agents can lower HbA1c levels.3 At the time of publication, DPP-4 inhibitors were not included because of limited safety data and experience with these agents. This omission has recently been criticized because it leaves practicing physicians and their patients with too few options.13 It is likely that the ADA will update the treatment guidelines in 2011. 
Figure 1.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
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Figure 1.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
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The American Association of Clinical Endocrinologists and the American College of Endocrinology have recently issued updated treatment recommendations.2 The AACE algorithm (Figure 2) emphasizes safety and efficacy vs costs of therapy and provides recommendations based on ambient HbA1c levels. This algorithm for glycemic control has 2 important features: (1) It favors the higher-priority use of GLP-1 agonists and DPP-4 inhibitors because of their effectiveness and overall safety profiles. These agents are preferred for most patients in place of sulfonylureas and glinides; (2) It moves sulfonylureas to a lower priority because of their associated risk of hypoglycemia and weight gain and the failure of these agents to provide sustainable improvement in glycemic control.14 
Incretin-Based Therapies: Similarities and Differences
Incretin-based therapies (ie, GLP-1 agonists and DPP-4 inhibitors) represent a novel mechanism of action with which to target the adverse effects of type 2 diabetes.15 They may be used in a complementary fashion with more traditional agents as part of combination treatment strategies. Both classes of incretin-based therapies are excellent choices for patients who have jobs that do not permit use of insulin therapy, who have hypoglycemic unawareness, or for whom hypo-glycemia is an especially worrisome potential side effect.1,2 Because their basis of action is similar, the use of GLP-1 agonists and DPP-4 inhibitors together is not recommended. 
Figure 2.
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
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Figure 2.
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
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Dipeptidyl peptidase-4 inhibitors prevent the rapid degradation of endogenous GLP-1, a hormone that normally promotes the production and secretion of insulin from pancreatic β cells in a glucose-dependent manner, minimizes the release of glucagon from pancreatic β cells, induces satiety, slows gastric emptying, and reduces hepatic glucose production.15 These inhibitors work by slightly increasing native GLP-1 levels above their normal physiologic levels. 
Glucagon-like peptide-1 agonists work by binding to GLP-1 receptors located throughout the body, especially on pancreatic β and β cells. Glucagon-like peptide-1 receptors are activated equally by a GLP-1 agonist or native GLP-1. An injection of a GLP-1 agonist “floods” the binding sites of the receptors at pharmacologic levels to a much greater degree than the DPP-4 inhibitors; thus, these drugs tend to lower HbA1c levels, reduce weight, slow gastric emptying, and lower glucagon levels more substantially than DPP-4 inhibitors.16 Pharmacologic GLP-1 binding at the receptor site also increases the likelihood of adverse effects such as nausea, vomiting, and diarrhea.17,18 Gradual dose titration can ameliorate these effects. Patients should be advised that eating beyond satiety may trigger nausea when using a GLP-1 agonist. Longer-acting GLP-1 agonists, such as liraglutide, have more profound effects on postprandial hyperglycemia as well as beneficial effects on FPG levels.19,20 
Two head-to-head trials16,19 of the GLP-1 agonists and the DPP-4 inhibitor sitagliptin helped identify differences between the 2 classes of agents. The first of these trials16 was more pharmacologic in nature—it evaluated the effects of the GLP-1 receptor agonist exenatide and the DPP-4 inhibitor sitagliptin on 2-hour postprandial glucose (PPG) levels, insulin and glucagon secretion, gastric emptying, and caloric intake in patients with type 2 diabetes.16 Although the study was limited by the 2-week duration of exposure, the data demonstrate that exenatide had a greater effect than sitagliptin in lowering PPG levels (Figure 3), increasing insulin secretion, and reducing PPG secretion in patients with type 2 diabetes. Exenatide also slowed gastric emptying and reduced calorie intake while sitagliptin did not. 
The second trial19 was a large (N=665), 26-week randomized trial adding once-daily liraglutide or once-daily sitagliptin to metformin for patients with inadequate glycemic control while receiving metformin monotherapy. Major findings from the study were greater reductions in HbA1c levels, FPG levels, and weight (Figure 4). Nausea initially occurred at higher rates with liraglutide 1.8 mg (27%) and 1.2 mg (21%) than with sitagliptin (5%). Nausea with liraglutide was transient. Most episodes occurred early, and few patients withdrew from the study. The median duration of nausea was 1 to 2 weeks; with continued administration, the prevalence of nausea was similar to that of sitagliptin.19 
Figure 3.
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
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Figure 3.
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
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GLP-1 Agonists
Combination Therapy
Short-acting exenatide has been available since 2005; it is approved for monotherapy or as part of combination therapy as an adjunct to diet and exercise. Clinical trials showed that exenatide 5 μg to 10 μg injected subcutaneously twice a day lowers HbA1c by almost a percentage point (0.8%) and at the same time is associated with weight loss of 3 to 6 pounds over 30 weeks. The greatest weight loss was obtained when exenatide was used with metformin.21 The most potent glucose-lowering effects occurred when exenatide was used in combination with metformin and a thiazolidinedione.22 Subsequent studies have shown HbA1c reductions of -1.3% and -1.6% at 9 and 12 months, respectively.23 In a “real world study,”24 a progressive reduction of weight (about 10 lb) was also observed. The primary effect of short-acting GLP-1 agonists such as exenatide is the lowering of PPG levels.25 Exenatide is also being developed as a long-acting (once weekly) product. This formulation is still being investigated, but it shows that a more persistent GLP-1 agonist can result in greater effects on FPG levels, as well as PPG levels, leading to more profound overall HbA1c reductions.26 When higher HbA1c levels (>9%) are involved, fasting plasma glucose levels are of particular importance because they make a substantially greater contribution to HbA1c. When patients are switched from short-acting to long-acting exenatide, there may be a temporary deterioration in glucose control until blood concentrations of the longer-acting agent are achieved. 
Liraglutide is the first of the long-acting GLP-1 agonists to be approved in the United States. This long-acting GLP-1 agonist is administered subcutaneously once a day. It has been studied in more than 65,000 patients internationally. Liraglutide has been studied in combination with metformin,20,27 sulfonylureas,28 thiazolidinediones plus metformin,29 and metformin plus sulfonylureas.20,30 As a longer-acting agent, more profound reductions in HbA1c levels have been observed with liraglutide across clinical trials than were observed in the twice-a-day exenatide registration trials, reflecting an effect on both FPG and PPG levels. When compared directly with a long-acting insulin analog, liraglutide resulted in statistically significant better glucose-lowering without the risk of hypo-glycemia or weight gain.30 
Both exenatide and liraglutide are associated with weight loss when used as monotherapy or as part of combination-therapy strategies. Weight loss is more profound in patients with greater starting body mass indices.31 Glucagon-like peptide-1 agonists also have beneficial effects on blood pressure.24,28 Lipid effects are more mixed from study to study but are generally beneficial; some (but not all) of these effects may be related to weight loss. Significant improvements in very low-density lipoprotein, free fatty acids, and triglycerides have been observed.32 
Head-to-head comparisons of liraglutide and exenatide show that liraglutide once a day provided statistically significant greater improvements in glycemic control than did exenatide twice a day (when used in combination with oral antidiabetic therapy).20 In the open-label extension to this trial, patients on exenatide were switched to liraglutide, and further reductions in HbA1c and weight were observed without an increased risk of hypoglycemia.33 Further lowering of HbA1c after switching from exenatide may be explained primarily by reductions in FPG levels by liraglutide. 
Monotherapy
Exenatide is now approved for use as a stand-alone medication with diet and exercise to improve glycemic control in adults with type 2 diabetes. Previously, exenatide was approved for use only in patients who were also taking other common diabetes medications and had not achieved adequate glycemic control. Patients treated with 5 μg or 10 μg of exenatide twice daily as monotherapy had HbA1c reductions of 0.7% and 0.9%, respectively, and lost 6.0 and 6.4 pounds, respectively, in a 26-week study.34 
Figure 4.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
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Figure 4.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
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The newer GLP-1 agonist, liraglutide, is not currently indicated as firstline therapy for patients inadequately controlled on diet and exercise; however, it may be used as monotherapy if other agents are not well tolerated or effective. A year-long randomized controlled trial conducted to compare liraglutide mono-therapy with glimepiride monotherapy in treatment-naïve patients supported monotherapy use.35 This study found that liraglutide was safe and effective as initial pharmacologic therapy for patients with type 2 diabetes and that it led to greater reductions in HbA1c, weight, hypoglycemia, and blood pressure than glimepiride did alone.35 
Safety Considerations
While associated with a low risk of hypo-glycemia (due to glucose-dependent mechanisms of action) and with weight loss (due to effects on gastric emptying and satiety), GLP-1 agonists do have adverse effects that physicians should be aware of when selecting treatment candidates and when initiating therapy in appropriate patients. For liraglutide, this includes the need to assess the patient's risk for medullary thyroid carcinoma and multiple endocrine neoplasia type 2—personal or family history of such precludes liraglutide use.36,37 For GLP-1 agonists and all incretin-based therapies, including DPP-4 inhibitors, there are precautions against using these drugs in patients with a history of pancreatitis. 
Based on my experience performing multiple clinical trials on GLP-1 agonists and DPP-4 inhibitors, I feel that the US Food and Drug Administration's directive38 to demonstrate that a new antidiabetic therapy is not associated with an unacceptable increase in cardiovascular risk can be helpful. When a patient who initiates therapy with an incretin drug has abdominal pain, nausea, and vomiting, he or she should immediately dis-continue the incretin therapy. Serial measurements of amylase and lipase should be performed every other day for 6 days. If these titers are rising, patients should undergo a computed tomography scan of the pancreas, which may confirm the presence of pancreatitis. However, linking pancreatitis directly to the use of an incretin may be difficult. Risk factors for pancreatic dysfunction in patients with diabetes include obesity, alcohol abuse, hypertriglyceridemia, and gall-stones, as well as use of medications such as angiotensin-converting enzyme inhibitors and diurectics.37 
It is advisable to discuss the possible adverse effects of pharmacotherapeutic regimens with patients whenever prescribing a new therapy. As stated earlier, the most common adverse effects of GLP-1 agonists are those related to the gastrointestinal system. Patients should not confuse feelings of satiety (a desired effect) with that of nausea. Risk of nausea may be limited by advising the patient to eat slowly, titrating the dose, gradually escalating the dose, and, for exenatide, appropriately timing the administration of the dose in relation to mealtime (ie, <60 minutes before eating with less nausea anecdotally reported closer to the upper limit of the 60-minute interval). Liraglutide may be administered without regard to mealtimes. The longer-acting agents, such as liraglutide, appear to be associated with a lower incidence of gastrointestinal adverse effects. 
Conclusion
Glucagon-like peptide-1 agonists represent an exciting addition to the treatment options for patients with type 2 diabetes—effective glucose-lowering without weight gain or substantial risk of hypo-glycemia—when used in combination with lifestyle modification alone or as part of combination therapy strategies. 
Case Study
Moshe is a 59-year-old Orthodox Jewish man who was diagnosed with type 2 diabetes mellitus 8 years ago. His comorbidities are characteristic of patients with type 2 diabetes: he has stage 2 hypertension (current blood pressure is 162/94 mm Hg) and mixed dyslipidemia (low-density lipoprotein cholesterol, 124 mg/dL; high-density lipoprotein, 38 mg/dL; triglycerides, 244 mg/dL; non–high-density lipoprotein cholesterol, 172 mg/dL; apolipoprotein B, 124 mg/dL). He had 2 stents placed in his left anterior descending artery in 2009. He also has evidence of peripheral sensory neuropathy (loss of vibratory sense and ankle reflexes). Other medical problems include erectile dysfunction. 
Figure 5.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
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Figure 5.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
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His medications include metformin hydrochloride, 850 mg twice daily (taken without regard to meal times); acarbose, 25 mg 3 times per day; aspirin, 81 mg once daily; lisinopril, 20 mg every day; and simvastatin, 40 mg every day. Moshe does not exercise frequently but does walk once a week. He is obese (body mass index, 38). Cardiovascular examination reveals orthostatic hypotension and no change in heart rate with inspiration, expiration, or valsalva (suggestive of autonomic cardiomyopathy). No retinopathy is evident on eye examination. Results of a spot urine test for microalbumin is negative; recent laboratory results show that serum creatinine is 1.1 mg/dL. 
Because of his cardiovascular comorbidities and his existing microvascular complications, his treatment goals have been individualized as follows: FPG range, 90 mg/dL to 130 mg/dL (less strict because of the presence of heart disease); PPG range, less than 180 mg/dL; and an HbA1c goal of 7.5%. His current HbA1c is 8.5%. Review of his self-monitoring blood glucose level, taken for a month before his most recent office visit, show that virtually no measurements are at goal (Figure 5). 
The patient is experiencing chronic hyperglycemia and requires intensification of his diabetes regimen. Neither his FPG nor PPG values are within the ADA-recommended target range (ie, FPG, 90-130 mg/dL; PPG, <180 mg/dL). Therefore, the patient was advised to increase his metformin to 1000 mg with breakfast and dinner, discontinue his acarbose, and begin liraglutide 0.6 mg/d. The patient was advised to check his blood glucose level daily upon rising. The dose will be increased to 1.2 mg after 1 week if the patient does not experience nausea. After 1 week at 1.2 mg/d, the patient's blood glucose meter will be downloaded. If the majority of his FPG levels are within the 90 mg/dL to 130 mg/dL range, the 1.2 mg dose will be continued. However, if his FPG levels are still higher than 130 mg/dL, the liraglutide dose will be increased to 1.8 mg/d. 
 This article was developed in part from a CME-certified symposium held on Wednesday, October 27, 2010, during the American Osteopathic Association's 115th Annual Osteopathic Medical Conference and Exposition in San Francisco, California.
 
 Financial Disclosures: Dr Unger discloses that he has received royalties from Lippincott Publishing; he has served on advisory boards for Amylin Pharmaceuticals, Inc; Novo Nordisk Inc; and Roche Laboratories Inc, and he has participated in speakers' bureaus for Amylin Pharmaceuticals, Inc; Eli Lilly and Company; and Novo Nordisk Inc. Dr Unger has also received research funding from Abbott Laboratories; Allergan, Inc; Arena Pharmaceuticals, Inc; AstraZeneca Pharmaceuticals LP; Cephalon, Inc; Daiichi Sankyo, Inc; Forest Pharmaceuticals, Inc; GlaxoSmithKline; Novo Nordisk Inc; Ortho-McNeil-Janssen Pharmaceuticals, Inc; Procter & Gamble Pharmaceuticals, Inc; Roche Laboratories Inc; sanofi-aventis US; Takeda Pharmaceuticals America, Inc; and Wyeth Pharmaceuticals.
 
 This article was developed with the assistance of Kate Mann, PharmD, a medical writer working with E&S MedEd Group. The author approved the final article and all of its contents.
 
 This supplement is supported by an educational grant from Novo Nordisk Inc.
 
Rodbard HW, Jellinger PS. Adding noninsulin antidiabetic drugs to metformin therapy for type 2 diabetes [letter]. JAMA. 2010;304(4):405-406; author reply 406-407.
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Unger J. Choosing among the incretin agents and why it matters. J Fam Pract. 2010;59(suppl 5):S30-S35.
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Buse JB, Rosenstock J, Sesti G, et al; LEAD-6 Study Group. Liraglutide once a day versus exenatide twice a day for type 2 diabetes: a 26-week randomised, parallel-group, multinational, open-label trial (LEAD-6). Lancet. 2009;374(9683):39-47. doi: 10.1016/S0140-6736(09)60659-0 .
DeFronzo RA, Ratner RE, Han J, Kim DD, Fineman MS, Baron AD. Effects of exenatide (exendin-4) on glycemic control and weight over 30 weeks in metformin-treated patients with type 2 diabetes. Diabetes Care. 2005;28(5):1092-1100.
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Marre M, Shaw J, Brandle M, et al; LEAD-1 SU Study Group. Liraglutide, a once-daily human GLP-1 analogue, added to a sulphonylurea over 26 weeks produces greater improvements in glycaemic and weight control compared with adding rosiglitazone or placebo in subjects with Type 2 diabetes (LEAD-1 SU). Diabet Med. 2009;26(3):268-278.
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Figure 1.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
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Figure 1.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
The American Diabetes Association/European Association for the Study of Diabetes 2009 consensus algorithm for the management of hyperglycemia in patients with type 2 diabetes mellitus. *Excludes glyburide and chlopropamide. †Insufficient clinical use to be confident regarding safety. Abbreviations: CHF, congestive heart failure; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Nathan et al.3 Copyright 2009 American Diabetes Association. From Diabetes, Vol. 32, 2009; 193-203. Reproduced by permission of the American Diabetes Association.
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Figure 2.
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
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Figure 2.
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
The American Association of Clinical Endocrinologists algorithm for the patho-physiologic approach to treating patients who have diabetic hyperglycemia. Abbreviations: A1C, glycated hemoglobin; AGI, alphaglucosidase inhibitor; DPP-4, dipeptidyl peptidase-4; GLP-1, glucagon-like peptide-1. Reprinted with permission from Rodbard et al. 2
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Figure 3.
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
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Figure 3.
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
Postprandial glucose (PPG) concentrations after treatment with exenatide or sitagliptin. (A) Comparison of postprandial glucose levels using exenatide, sitagliptin, and no medication (baseline). (B) Comparison of 2-hour postprandial glucose levels using exenatide and sitagliptin by treatment sequence. Reprinted with permission from DeFronzo et al. 16
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Figure 4.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
View Original  |  Slide (.ppt)
Figure 4.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
Comparisons of changes in (A) glycated hemoglobin (HbA1c), (B) fasting plasma glucose, and (C) weight loss in patients taking liraglutide vs those taking sitagliptin over 26 weeks. Adapted from Pratley et al.19 Copyright 2009 American Diabetes Association. From Diabetes, Vol 58, 2009; 773-795. Reproduced by permission of the American Diabetes Association.
View Original  |  Slide (.ppt)
Figure 5.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
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Figure 5.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
Blood glucose levels of a 59-year-old man with type 2 diabetes mellitus. Glucose measurements were taken for a month before his most recent office visit.
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Table.
Treatment Goals for Patients With Type 2 Diabetes
Parameter
Treatment Goal
▪ Glucose
□ Glycated hemoglobin, %<7% for most; closer to normal for healthy; relaxed for those with limited life expectancy (individualize based on age, comorbidities, and duration of disease)
□ Fasting plasma glucose, mg/dL90-130
□ 2-hour postprandial glucose, mg/dL<180
▪ Lipids, mg/dL
□ Low-density lipoprotein cholesterol≤70 highest risk (established coronary artery disease); <100 high risk plus 2 risk factors*
□ Non-high-density lipoprotein cholesterol<100 highest risk; <130 high risk
□ Apolipoprotein B levels<80 highest risk; <90 high risk
□ High-density lipoprotein>40 in men; >50 in women
□ Triglycerides<150
▪ Blood Pressure, mm Hg
□ Systolic<130
□ Diastolic<80
▪ Weight
□ Weight loss
 Reduce by at least 5%-10%; avoid weight regain
 *Risk factors are cigarette smoking; hypertension (blood pressure ≥140/90 mm Hg or on antihypertensive medication); low high-density lipoprotein cholesterol (<40 mg/dL); family history of premature congestive heart failure; and age (men, ≥45 y; women, ≥55 y).
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Table.
Treatment Goals for Patients With Type 2 Diabetes
Parameter
Treatment Goal
▪ Glucose
□ Glycated hemoglobin, %<7% for most; closer to normal for healthy; relaxed for those with limited life expectancy (individualize based on age, comorbidities, and duration of disease)
□ Fasting plasma glucose, mg/dL90-130
□ 2-hour postprandial glucose, mg/dL<180
▪ Lipids, mg/dL
□ Low-density lipoprotein cholesterol≤70 highest risk (established coronary artery disease); <100 high risk plus 2 risk factors*
□ Non-high-density lipoprotein cholesterol<100 highest risk; <130 high risk
□ Apolipoprotein B levels<80 highest risk; <90 high risk
□ High-density lipoprotein>40 in men; >50 in women
□ Triglycerides<150
▪ Blood Pressure, mm Hg
□ Systolic<130
□ Diastolic<80
▪ Weight
□ Weight loss
 Reduce by at least 5%-10%; avoid weight regain
 *Risk factors are cigarette smoking; hypertension (blood pressure ≥140/90 mm Hg or on antihypertensive medication); low high-density lipoprotein cholesterol (<40 mg/dL); family history of premature congestive heart failure; and age (men, ≥45 y; women, ≥55 y).
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