Drowsiness, tiredness, headache, acne, and metallic/garlic-like taste in the mouth may occur as your body gets used to the medication. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she 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 any of these unlikely but serious side effects occur: decreased sexual ability, vision changes, numbness/tingling of arms/legs, muscle weakness, mental/mood changes (e.g., agitation, extreme excitement/confusion), seizures, confusion.
This drug may rarely cause serious (rarely fatal) liver disease. If you notice any of the following unlikely but very serious side effects, tell your doctor right away: persistent nausea/vomiting, severe stomach/abdominal pain, dark urine, yellowing eyes/skin.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention 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.