Some common side effects can include:
temporary blurred vision, cloudy vision, double vision, temporary burning/stinging/itching/redness of the eye, watery eyes, dry eyes, feeling as if something is in the eye, drooping eyelid, sensitivity of eyes to light, bitter or strange taste in the mouth, cough, flu symptoms, nausea, upset stomach, stomach pain, back pain, sore throat, stuffy nose, headache, drowsiness
More serious side effects can also include:
dizziness, slow or irregular heartbeat, muscle weakness, mental/mood changes, coldness/numbness/pain in the hands or feet
Speak with your doctor or pharmacist for help managing any side effects that become too severe during your treatment with Cosopt. If you experience any serious side effects contact your doctor for additional medical treatment.