Data Supporting the Cardiovascular Safety of VIVUS’ Qsymia® Published in The Journal of Clinical Endocrinology & Metabolism
“The results of this study provide some assurance that, despite the increase in heart rate seen in the clinical trials, current use of phentermine in combination with topiramate did not appear to be associated with a higher cardiovascular risk. We note that the confidence intervals for this observation were broad, indicating that the data were imprecise and compatible with a considerable range of possible effects,” said
“Obesity is a significant and growing problem in
More than 500,000 patients were included in this retrospective study, which evaluated risk of MACE among current users of Qsymia, phentermine and topiramate in combination (PHEN/TPM), phentermine (PHEN), and topiramate (TPM), compared to the risk among patients who were former users who had discontinued these medications. MACE was defined as hospitalization for acute myocardial infarction (AMI) or stroke or in-hospital cardiovascular-related death, as determined via discharge status and ICD-9-CM diagnoses.
“Qsymia is an effective tool as a component of body mass index management regimens. These study results provide additional evidence that its use does not increase MACE risk,” said
The efficacy and safety of Qsymia have been demonstrated in multiple clinical trials and peer-reviewed publications, including:
- A Phase 3 randomized, placebo-controlled Phase 3 trial conducted in 1,267 obese adults with body-mass index (BMI) ≥ 35 kg/m2 (EQUIP).2 Patients were randomized to placebo, phentermine/topiramate controlled release (PHEN/TPM CR) 3.75/23 mg, or PHEN/TPM CR 15/92 mg, added to a reduced-energy diet. At 56 weeks, patients lost 1.6%, 5.1% and 10.9%, respectively, of baseline body weight (p<0.0001). A significantly higher proportion of patients achieved at least 5% weight loss in the PHEN/TPM CR groups compared with placebo (p<0.0001). Study authors suggest that the beneficial effects of PHEN/TPM CR on weight, blood pressure, lipids, and glycemic measures mitigate any adverse effects on heart rate.
- A Phase 3 randomized, placebo-controlled 56-week trial conducted in 2,487 adults with BMI 27–45 kg/m2 and two or more comorbidities (hypertension, dyslipidaemia, diabetes or prediabetes, or abdominal obesity) (CONQUER).3 Patients were randomly assigned to receive PHEN/TPM CR 7.5/46.0 mg (n = 498), PHEN/TPM CR 15.0/92.0 mg (n = 995) or placebo (n = 994). At 56 weeks, change in bodyweight in the 2,448 patients available for analysis was –1.4 kg, –8.1 kg, and –10.2 kg (p<0.0001) in the patients assigned to placebo, PHEN/TPM CR 7.5/46.0 mg, and PHEN/TPM CR 15.0/92.0 mg, respectively. A significantly higher proportion of patients achieved at least 5% or at least 10% weight loss in the PHEN/TPM CR groups compared with placebo (p<0.0001) for all comparisons. Study authors also noted significant improvements in blood pressure, waist circumference, lipid concentrations, glycaemia and inflammatory biomarkers (high sensitivity C-reactive protein and adiponectin) in the PHEN/TPM CR group compared with placebo.
- A two-year Phase 3 randomized, placebo-controlled study (SEQUEL)4, which was a 52-week extension study of CONQUER. A total of 866 patients from CONQUER were eligible for the extension study, of which 676 elected to participate in SEQUEL. At week 108, PHEN/TPM CR was associated with significant, sustained weight loss (intent-to-treat with last observation carried forward; p < 0.0001 compared with placebo). Percentage changes from baseline in body weight were –1.8%, –9.3%, and –10.5% for placebo, 7.5/46, and 15/92, respectively. Significantly more PHEN/TPM CR–treated subjects at each dose achieved ≥ 5%, ≥ 10%, ≥ 15%, and ≥ 20% weight loss compared with placebo (p < 0.001). No cardiovascular safety signals were detected.
° A sub-analysis of SEQUEL conducted in 475 patients with prediabetes and/or metabolic syndrome (MetS).5 After 108 weeks, subjects with prediabetes and/or MetS in the placebo, 7.5/46, and 15/92 groups experienced mean percent weight loss of 2.5%, 10.9%, and 12.1%, respectively (p < 0.0001 vs. placebo). These losses were associated with reductions of 70.5% and 78.7% in the annualized incidence rate of type 2 diabetes for those receiving 7.5/46 and 15/92, respectively (p < 0.05), versus placebo. No cardiovascular safety signals were observed in this patient subset.
- A Phase 2 randomized, double-blind, placebo-controlled study of PHEN/TPM CR 15/92 for the treatment of moderate to severe obstructive sleep apnea (OSA) in obese adults.6 A total of 45 patients were randomized to placebo (n = 23) or PHEN/TPM CR (n = 22) for 28-week treatment periods in addition to lifestyle-modification counseling. At 28 weeks, changes in the apnea-hypopnea index (AHI), significantly favored PHEN/TPM CR over placebo (-31.5 events/h vs. 16.6 events/h, p = 0.0084). At week 28 there was also a positive, significant (p = 0.0003) correlation between percent change in weight and change in AHI. Authors also noted significant improvements in overnight oxygen saturation and reduction in blood pressure compared to placebo.
- A subset analysis of health-related quality of life (HRQOL) conducted in 2,374 patients who had participated in EQUIP (n = 751) or CONQUER (n = 1,623) and completed HRQOL questionnaires at weeks 28 and 56. Significant improvements in both obesity-specific and physical HRQOL were observed at 56 weeks in both trials (p < 0.0001). Although reduction in BMI accounted for the majority of improvements in obesity-specific and physical HRQOL, decrease in depressive symptoms was also a significant mediator.
Qsymia is approved in the United States and is indicated as an adjunct to a reduced-calorie diet and increased physical activity for chronic weight management in adults with an initial body mass index (BMI) of 30 kg/m2 or greater (obese) or 27 kg/m2 or greater (overweight) in the presence of at least one weight-related medical condition such as high blood pressure, type 2 diabetes, or high cholesterol.
The effect of Qsymia on cardiovascular morbidity and mortality has not been established. The safety and effectiveness of Qsymia in combination with other products intended for weight loss, including prescription and over-the-counter drugs, and herbal preparations, have not been established.
Important Safety Information
Qsymia (phentermine and topiramate extended-release) capsules CIV is contraindicated in pregnancy; in patients with glaucoma; in hyperthyroidism; in patients receiving treatment or within 14 days following treatment with monoamine oxidase inhibitors; or in patients with hypersensitivity to sympathomimetic amines, topiramate, or any of the inactive ingredients in Qsymia.
Qsymia can cause fetal harm. Females of reproductive potential should have a negative pregnancy test before treatment and monthly thereafter and use effective contraception consistently during Qsymia therapy. If a patient becomes pregnant while taking Qsymia, treatment should be discontinued immediately, and the patient should be informed of the potential hazard to the fetus.
The most commonly observed side effects in controlled clinical studies, 5% or greater and at least 1.5 times placebo, include paraesthesia, dizziness, dysgeusia, insomnia, constipation, and dry mouth.
Certain statements in this press release are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995 and are subject to risks, uncertainties and other factors, including risks and uncertainties related to the timing of initiation and completion of the post-approval clinical studies required as part of the approval of Qsymia by the
|VIVUS, Inc.||Investor Relations: Lazar Partners|
|Mark Oki||David Carey|
|Chief Financial Officer||Managing Director|
1 Ritchey ME, Harding A, Hunter S, Peterson C, Sager PT, Kowey PR, et al. Cardiovascular safety during and after use of phentermine and topiramate. J Clin Endocrinol Metab 2019;104(2):513-522.
2 Allison DB, Gadde KM, Garvey WT, Peterson CA, Schwiers ML, Najarian T, et al. Controlled-release phentermine/topiramate in severely obese adults: a randomized controlled trial (EQUIP). Obesity 2012;20(2):330-42.
3 Gadde KM, Allison DB, Ryan DH, Peterson CA, Troupin B, Schwiers, et al. Effects of low-dose, controlled-release, phentermine plus topiramate combination on weight and associated comorbidities in overweight and obese adults (CONQUER): a randomised, placebo-controlled, phase 3 trial. Lancet 2011;37(9774):1341-52.
4 Garvey TW, Ryan DH, Look M, Gadde KM, Allison DB, Peterson CA, Schwiers M, et al. Two-year sustained weight loss and metabolic benefits with controlled-release phentermine/topiramate in obese and overweight adults (SEQUEL): a randomized, placebo-controlled, phase 3 extension study. Am J Clin Nutr 2012; 95(2):297-308.
5 Garvey TW, Ryan DH, Henry R, Bohannon NJV, Toplak H, Schwiers M, et al. Prevention of Type 2 diabetes in subjects with prediabetes and metabolic syndrome treated with phentermine and topiramate extended release. Diabetes Care 2014;37(4):912-21.
6 Winslow DH, Bowden CH, DiDonato KP and
Source: VIVUS, Inc.