The Food and Drug Administration (FDA) is warning consumers to not buy or use the following tainted weight loss supplements:

  • Black Mamba Hyperrush
  • Lean Body Extreme
  • Natural Max Slimming

An FDA analysis revealed that Black Mamba Hyperrush contained sibutramine and phenolphthalein. Sibutramine is a controlled substance that was withdrawn from the market in October 2010 due to safety reasons. It may increase blood pressure and/or pulse rate in some patients. Patients with a history of coronary artery disease, congestive heart failure, arrhythmias, or stroke may be at an increased risk. Phenolphthalein, an unapproved chemical in the United States, has demonstrated a cancer-causing risk in some studies.

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Lean Body Extreme was found to contain sibutramine, desmethyl sibutramine, phenolphthalein, and sildenafil. Sildenafil is a phosphodiesterase type 5 inhibitor found in the prescription drug Viagra (Pfizer). Viagra is approved for the treatment of erectile dysfunction. It may interact with nitrates found in drugs such as nitroglycerin and lower blood pressure.

Natural Max Slimming was found to contain sildenafil, fluoxetine, and sibutramine. Fluoxetine, a selective serotonin reuptake inhibitor (SSRI), is approved to treat depression, bulimia, obsessive-compulsive disorders, panic disorder, and premenstrual dysphonic disorder. SSRIs have been linked to serious adverse effects such as suicidal thinking, abnormal bleeding, and seizures. Ventricular arrhythmia or sudden death can occur in patients taking concomitant aspirin, ibuprofen, antidepressants, and other drugs.

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