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Prescription weight-loss drugs

Orlistat (Xenical)

You take prescription orlistat by mouth three times a day. You also can get the pill in a lower strength without a prescription (Alli). Orlistat can cause side effects such as passing gas and having loose stools. You follow a low-fat diet when taking this medicine.

Rarely, people who take orlistat have serious liver injury. But research hasn't shown that the medicine causes liver injuries.