Sit and Slim II Contains Sibutramine, Hidden Ingredient

October 10, 2014 — The FDA has published a safety warning after finding two dangerous hidden ingredients in Sit and Slim II diet pills.

FDA laboratory analysis confirmed that Sit and Slim II contains sibutramine, a controlled substance that was pulled off the market in October 2010 for safety reasons.

Tests also found phenolphtalein, an unapproved drug that studies have linked with cancer. It is a laxative that was sold for most of the 20th century in over-the-counter drugs like Ex-Lax and Feen-A-Mint.

Sit and Slim II is a dietary supplement that is marketed for weight-loss. It is primarily sold online, on websites including, for $18-19 depending on the retailer. It might also be sold in retail stores. Some of the writing on the box is in Chinese, but the FDA did not name a manufacturer.

The FDA warns consumers not to purchase or use Sit and Slim II due to life-threatening health risks:

“The product poses a threat to consumers because sibutramine is known to substantially increase blood pressure and/or pulse rate in some patients and may present a significant risk for patients with a history of coronary artery disease, congestive heart failure, arrhythmias, or stroke.”

Sibutramine is an appetite-suppressant that was originally sold as Meridia, a prescription drug for the treatment of obesity. The FDA pulled it off the market after the SCOUT clinical trial linked sibutramine with a 16% increased risk of cardiovascular events than patients on a placebo.

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