Drowsiness, tiredness, dizziness, lightheadedness, dry mouth, and diarrhea may occur as your body adjusts to the medication. If any of these effects last or get worse, tell your doctor or pharmacist promptly.To lower your risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.Tell your doctor right away if you have any serious side effects, including: difficulty speaking, drooling, unwanted/uncontrolled movements, muscle stiffness, shaking (tremor), decrease in sexual ability, tenderness/swelling of the breast, mental/mood changes (such as confusion, depression, severe anxiety), signs of kidney problems (such as change in the amount of urine, painful urination, pink/bloody urine).A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.