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Posted January 29, 2019

Prescription Drugs Found in Four Weight Loss Supplements

On January 28, 2019, the FDA the FDA warned consumers not to buy or use the following weight loss supplements because they were found to contain sibutramine and/or phenolphthalein: Sibutramine, the active ingredient in the obesity drug Meridia, was removed from the U.S. market in October 2010 because it can substantially increase blood pressure and pulse rate in some individuals, and may present a significant risk for patients with a history of coronary artery disease, congestive heart failure, arrhythmias, or stroke. This drug may also interact, in life-threatening ways, with other medications a consumer may be taking. N-desmethylsibutramine is similar to sibutramine.

Phenolphthalein, once an ingredient in some over-the-counter laxative products, was reclassified by the FDA in 1999 as "not generally recognized as safe and effective."

Sildenafil, the active ingredient in the prescription drug Viagra, and tadalafil, the active ingredient in Cialis, are prescribed for erectile dysfunction. These drugs can cause symptoms like headache and flushing, and can interact with medications containing nitrates such as nitroglycerine, resulting in dangerously low blood pressure.

Benproperine is cough suppressant that is not approved by FDA and therefore its safety and efficacy have not been established. Diphenhydramine is an over-the-counter antihistamine used for seasonal allergy treatment which can cause drowsiness and affect mental alertness.

Consumers who have purchased these supplements should not it and contact their healthcare provider if they have experienced any adverse side effects. Consumers and healthcare providers are also encouraged to report any adverse reactions to the FDA's MedWatch Voluntary Reporting Program.

See ConsumerLab's Review of Weight Loss Supplements for tests of related products.

See Related Warnings:

Weight Loss Supplement Tainted With Drug

Weight Loss Supplement Containing Hidden Drug Recalled

Pharmaceutical Drugs Found In Dietary Supplements Pose Danger to Consumers

Weight Loss Supplement Containing Undeclared Drug Recalled

For more recalls and warnings, use the link below.