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What are the side effect of phentermine as a prescription weight loss drug?

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Side effects can be serious, such as raising your blood pressure or causing heart palpitations, restlessness, dizziness, tremor, insomnia, shortness of breath, chest pain, and trouble doing activities you've been able to do. Phentermine may make you drowsy, hampering your ability to drive or operate machinery. As with some other appetite suppressants, there's a risk of becoming dependent upon the drug. Less serious side effects include dry mouth, unpleasant taste, diarrhea, constipation, and vomiting. Don't take it late in the evening, as it may cause insomnia. Phentermine is an amphetamine. Because of the risk of addiction or abuse, such stimulant drugs are "controlled substances," which means they need a special type of prescription.

SOURCES:

National Institute of Diabetes and Digestive and Kidney Disease: "Prescription Medications for the Treatment of Obesity."

FDA: "FDA Drug Safety Communication: Completed Safety Review of Xenical/Alli (orlistat) and Severe Liver Injury" and "Medications Target Long-Term Weight Control."

MedlinePlus: "Phentermine."

News release, FDA.

MedlinePlus.

 

Reviewed by Michael W. Smith on February 25, 2020

SOURCES:

National Institute of Diabetes and Digestive and Kidney Disease: "Prescription Medications for the Treatment of Obesity."

FDA: "FDA Drug Safety Communication: Completed Safety Review of Xenical/Alli (orlistat) and Severe Liver Injury" and "Medications Target Long-Term Weight Control."

MedlinePlus: "Phentermine."

News release, FDA.

MedlinePlus.

 

Reviewed by Michael W. Smith on February 25, 2020

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What else should you know about phentermine as a prescription weight loss drug?

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