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

• lithium (Eskalith, Lithobid, others);

• a blood thinner such as warfarin (Coumadin); or

• rifampin (Rifadin, Rifamate, Rimactane).

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

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

• dizziness, fainting, fast or pounding heartbeat;

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

• tremor (uncontrolled shaking);

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

• stabbing chest pain, feeling short of breath, cough with yellow or green mucus;

• sudden mood changes;

• confusion, agitation, hallucinations, unusual thoughts or behavior; or

• jaundice (yellowing of your skin or eyes).

Less serious side effects may include:

• headache, dizziness, drowsiness;

• sleep problems (insomnia);

• feeling restless or anxious;

• mild skin rash or itching;

• breast enlargement, irregular menstrual periods, loss of interest in sex; or

• dry mouth, blurred vision, urinating less than usual.

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