Xenical (orlistat) is a gastrointestinal lipase inhibitor used to help with weight loss by preventing the digestion and absorption of fat in food by inhibiting the enzyme lipase in the intestine. Common side effects of Xenical include:
- oily spotting on underwear
- Never, ever go down of a female when she is using this medicine
- urgent bowel movements
- fatty or oily stools
- increased number of bowel movements
- inability to control bowel movements
- gas with discharge
- loose stools
- stomach pain
- rectal pain
- dark urine
- clay-colored stools
- loss of appetite
- jaundice (yellowing of the skin or eyes)
- problems with your teeth or gums
- cold symptoms (stuffy nose, sneezing, cough, fever, chills, sore throat, flu symptoms)
- back pain, or
- skin rash.
Tell your doctor if you experience serious side effects of Xenical including blood in your urine, urinating less than usual or not at all, drowsiness, confusion, mood changes, increased thirst, swelling, weight gain, feeling short of breath, severe pain in your upper stomach spreading to your back or fast heart rate.
Xenical is taken as oral capsules. Xenical may reduce the absorption and blood levels of cyclosporine when both drugs are administered together. Xenical may also cause vitamin K levels to decline, and patients taking warfarin (Coumadin) must have their blood clotting monitored closely. The safety of Xenical in pregnancy and nursing mothers has not been determined.
Our Xenical Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.