At the time of approval, the FDA said Belviq's manufacturer, Arena Pharmaceuticals, would be required to conduct six post-marketing studies, including a long-term cardiovascular trial to assess the risk of heart attack and stroke.

The most common side effects of Belviq in zi xiu tang capsule nondiabetic patients included headache, dizziness and fatigue, according to the FDA. In diabetic patients, side effects included pain and low blood sugar.

In addition, some people taking medicines such as Belviq have reported heart valve problems, according to Eisai Inc., which markets the drug.

"It is not known if Belviq changes your risk of heart problems or of stroke, or death due to heart problems or stroke," according to the drug's website.

The U.S. Food and Drug Administration has approved Belviq, a new drug that aims to fight obesity and can help people drop about five percent zi xiu tang pollen capsules of their body weight. The pill will hit the market next week.

Those who have a weight-related condition such as Type 2 diabetes or hypertension, along with a body mass index of 27, or those with a BMI higher than 30, are eligible for the prescription drug.

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