Hi, Buspar (Buspirone) is a drug used for anxiety and is known to cause gastro-intestinal side effects in the initial few days. However, most of such side effects are self limiting and mild. If you having too much trouble with these side effects, you must report them to your treating doctor. Usually, if the symptoms are mild, they stop in a week or so. In case of severe or long lasting symptoms, we have to re-evaluate the prescription. One another point, make sure you consistently take buspar either with food or without food, whichever you chose. Don t change from one day with food and another day without food, as it will affect the levels of the drug in your body. Wishing you speedy recovery.