Get emergency medical help if you have signs of an allergic reaction to Risperdal: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement);
breast swelling or tenderness (in men or women), nipple discharge, impotence, lack of interest in sex, missed menstrual periods;
severe nervous system reaction - very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out;
low white blood cells - sudden weakness or ill feeling, fever, chills, sore throat, mouth sores, red or swollen gums, trouble swallowing, skin sores, cold or flu symptoms, cough, trouble breathing;
low levels of platelets in your blood - easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
high blood sugar - increased thirst, increased urination, dry mouth, fruity breath odor; or
penis erection that is painful or lasts 4 hours or longer.
Common Risperdal side effects may include:
headache;
dizziness, drowsiness, feeling tired;
tremors, twitching or uncontrollable muscle movements;
agitation, anxiety, restless feeling;
depressed mood;
dry mouth, upset stomach, diarrhea, constipation;
weight gain; or
cold symptoms such as stuffy nose, sneezing, sore throat.
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.
 Risperdal side effects (more detail)
