Phentermine side effects occur with different people and at different dosages. Decide for yourself if Phentermine 37.5 mg and below are worth the weight loss Learn about the potential side effects of phentermine. Includes common and rare side effects information for consumers and healthcare professionals. Learn about Qsymia (Phentermine and Topiramate) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Find a comprehensive guide to possible side effects including common and rare side effects when taking Qsymia (Phentermine and Topiramate) for healthcare ... Cardiovascular Problems. Ingesting phentermine may produce some serious problems related to your heart. It may significantly increase your blood pressure ... Phentermine (Adipex-P and Lomaira) is a schedule IV controlled prescription drug used as a short-term weight loss in conjunction with diet and other lifestyle ... A report on what Phentermine is, how it works, it's side effects and user feedback. Mild Side Effects. As a weight-loss medication goes, phentermine is considered tolerable by most people; however, it may cause some mild side effects.