Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

Less common or rare

Bloody or dark urine; chest pain; fainting; hallucinations (seeing or hearing things that are not there); mental depression or other mood changes; ringing or buzzing in the ears; skin rash or itching

Symptoms of overdose

Blurred or double vision; convulsions (seizures); muscle weakness (severe); shortness of breath or unusually slow or troubled breathing; vomiting

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Confusion; dizziness or lightheadedness; drowsiness; nausea; unusual weakness, especially muscle weakness

Less common or rare

Abdominal or stomach pain or discomfort; clumsiness, unsteadiness, trembling, or other problems with muscle control; constipation; diarrhea; difficult or painful urination or decrease in amount of urine; false sense of well-being; frequent urge to urinate or uncontrolled urination; headache; loss of appetite; low blood pressure; muscle or joint pain; numbness or tingling in hands or feet; pounding heartbeat; sexual problems in males; slurred speech or other speech problems; stuffy nose; swelling of ankles; trouble in sleeping; unexplained muscle stiffness; unusual excitement; unusual tiredness; weight gain

Some side effects may occur after you have stopped taking this medicine, especially if you stop taking it suddenly. Check with your doctor immediately if any of the following effects occur:

Convulsions (seizures); hallucinations (seeing or hearing things that are not there); increase in muscle spasm, cramping, or tightness; mood or mental changes; unusual nervousness or restlessness

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.