Weight loss medications can differ substantially in efficacy, adverse effect profiles, and monitoring considerations, making patient-specific counseling essential. In this blog post, I share common practice pearls for weight loss medications.
GLP-1 Type Agents
Slow dose titration is one of the most important practice pearls because nausea, vomiting, and constipation are common early adverse effects. Patients should be encouraged to eat smaller meals, avoid overeating, and maintain hydration to improve tolerability. Monitoring for gallbladder disease, pancreatitis symptoms, and excessive muscle loss during rapid weight reduction is important. Recall that these medications are contraindicated in certain types of thyroid cancer (excellent board exam nugget).
Clinicians should also remember that these agents delay gastric emptying, which may affect the absorption of oral medications. This usually isn’t clinically significant, but it may be something to consider if a patient is taking a narrow therapeutic index medication or if the patient’s clinical scenario changes due to an inadequately treated condition.
Contrave (bupropion/naltrexone)
Contrave combines bupropion and naltrexone to support weight loss through appetite suppression and craving reduction, but several important practice pearls should be remembered. Because bupropion may increase blood pressure and lower seizure threshold, caution is warranted in patients with uncontrolled hypertension or seizure disorders.
The naltrexone component can block opioid analgesics, making medication reconciliation especially important before surgery or in acute pain management. Use of Contrave in combination with opioids can lead to withdrawal and/or a lack of efficacy from analgesic opioids.
Qsymia (phentermine/topiramate)
Qsymia combines phentermine and topiramate to promote weight loss through appetite suppression and enhanced satiety. One of the most important practice pearls is monitoring for stimulant-related adverse effects, such as insomnia, increased heart rate, and anxiety, especially early in therapy. Morning administration may help reduce sleep disturbances. This is primarily due to the phentermine component.
Topiramate carries teratogenic risk, making reliable contraception and pregnancy counseling essential for patients of childbearing potential. Abrupt discontinuation should be avoided because topiramate withdrawal may increase seizure risk. Clinicians should also monitor for cognitive adverse effects such as word-finding difficulty or impaired concentration.
Weight loss medications have plenty of risks that pharmacists and other healthcare professionals should be aware of. I’ve provided some of the most important factors to remember.
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