Get emergency medical help if you have any of these signs of an allergic reaction to Fanapt:hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop taking this medication and call your doctor at once if you have a serious side effect such as: *very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out; *twitching or uncontrollable movements of your eyes, lips, tongue, face, arms, or legs; *tremor (uncontrolled shaking); *trouble swallowing; *seizure (convulsions); *urinating less than usual or not at all; *fever, chills, body aches, flu symptoms; *white patches or sores inside your mouth or in your lips; *feeling like you might pass out; or *penis erection that is painful or lasts 4 hours or longer. Less serious Fanapt side effects may include: *dizziness, drowsiness, tired feeling; dry mouth, stuffy nose, sore throat; nausea, diarrhea, upset stomach; joint pain; *breast swelling or discharge; *changes in menstrual periods; *blurred vision; *weight gain; or *mild skin rash.
