• fever, stiff muscles, confusion, sweating, fast or uneven heartbeats;

• restless muscle movements in your eyes, tongue, jaw, or neck;

• tremor (uncontrolled shaking);

• trouble swallowing; or

• feeling light-headed, fainting.

Less serious side effects may include:

• mild restlessness, drowsiness, or tremor;

• sleepiness, dreaming more than usual;

• blurred vision;

• dizziness or headache;

• weight gain;

• problems with urination;

• nausea, dry mouth, constipation; or

• decreased sex drive, impotence, or difficulty having an orgasm.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

What other drugs will affect risperidone?

Before taking this medication, tell your doctor if you are taking any of the following medicines:

• carbamazepine (Carbatrol, Tegretol);

• phenytoin (Dilantin);

• phenobarbital (Luminal, Solfoton);

• clozapine (Clozaril);

• fluoxetine (Prozac) or paroxetine (Paxil);

• rifampin (Rifadin, Rimactane, Rifater); or

• medicines used to treat Parkinson's Disease such as levodopa (Dopar, Larodopa, Sinemet, Atamet, others), bromocriptine (Parlodel, others), pergolide (Permax), pramipexole (Mirapex), or ropinirole (Requip).

This list is not complete and there may be other drugs that can interact with risperidone. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Where can I get more information?

Your pharmacist can provide more information about risperidone.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.