Temporary blurred vision, temporary burning/stinging/itching/redness of the eye, watery eyes, dry eyes, feeling as if something is in the eye, sensitivity of eyes to light, strange taste in the mouth, or headache may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. 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: dizziness, slow/irregular heartbeat, muscle weakness, mental/mood changes, coldness/numbness/pain in the hands or feet, vision changes, signs of a kidney stone (such as pain in the back/side/abdomen, nausea/vomiting, blood in the urine), yellowing eyes or skin, dark urine, unusual tiredness/weakness, easy bruising/bleeding, signs of infection (such as sore throat that doesn't go away, fever, chills). Get medical help right away if you have any very serious side effects, including: eye redness or discharge that doesn't stop, eye or eyelid swelling, eye pain, sudden unexplained weight gain, chest pain, weakness on one side of the body, trouble speaking, confusion, severe dizziness, fainting. 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.

Some products that may interact with this drug include: oral beta-blockers (such as propranolol), oral carbonic anhydrase inhibitors (such as acetazolamide, methazolamide), clonidine, certain antidepressants (including SSRIs such as fluoxetine), digoxin, epinephrine, methyldopa, quinidine.