Common side effects of this medicine include nausea, vomiting, diarrhea, flatulence, trouble sleeping, headache, and rash. These are usually not serious but inform your doctor if they bother you or will not go away. It can also increase the risk of bone loss (osteoporosis) if you take it for a long time. Exercise regularly and take calcium and vitamin D supplements as suggested by your doctor. Some people may put on weight while taking medicines to treat HIV/AIDS.