Some common side effects are:
oily spotting on underwear, flatulence, urgent bowel movements, fatty or oily stools, increased number of bowel movements, inability to control bowel movements, gas with discharge, loose stools, stomach pain, nausea, vomiting, diarrhea, rectal pain, weakness, dark urine, clay-colored stools, itching, 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), headache, back pain, skin rash
Speak with your doctor or pharmacist for help managing any side effects that become too severe during your treatment with Orlistat.