What are Alli (Orlistat) side effects?
2010
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop taking Alli and call your doctor at once if you have severe pain in your upper stomach spreading to your back, nausea and vomiting, and a fast heart rate. These could be signs of pancreatitis.
The following side effects occur commonly with the use of this medication. They are the natural effects of Alli’s fat-blocking action and are actually signs that the medication is working properly. These side effects are usually temporary and may lessen as you continue treatment:
- oily spotting in your undergarments;
- oily or fatty stools;
- orange or brown colored oil in your stool;
- gas with discharge, an oily discharge;
- loose stools, or an urgent need to go to the bathroom, inability to control bowel movements;
- an increased number of bowel movements;
- stomach pain, nausea, vomiting, diarrhea, rectal pain; or
- weakness, dark urine, clay-colored stools, itching, loss of appetite, or jaundice (yellowing of the skin or eyes).
Other side effects that may occur while taking Alli include:
- problems with your teeth or gums;
- cold symptoms such as stuffy nose, sneezing, cough;
- fever, chills, sore throat, flu symptoms;
- headache, back pain; or
- mild skin rash.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 begin_of_the_skype_highlighting 1-800-FDA-1088 end_of_the_skype_highlighting.


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