Quinine (Systemic)

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 immediately if any of the following side effects occur:

More common

Abdominal or stomach cramps or pain; diarrhea; nausea; vomiting

Less common

Anxiety; behavior change, similar to drunkenness; black, tarry stools; blood in urine or stools; blurred vision; cold sweats; confusion; convulsions (seizures) or coma; cool pale skin; cough or hoarseness; difficulty in concentrating; drowsiness; excessive hunger; fast heartbeat; fever or chills; headache; lower back or side pain; nervousness; nightmares; painful or difficult urination; pinpoint red spots on skin; restless sleep; shakiness; slurred speech; sore throat; unusual bleeding or bruising; unusual tiredness or weakness

Rare

Difficulty in breathing and/or swallowing; disturbed color perception; double vision; hives; increased sweating; muscle aches; night blindness; reddening of the skin, especially around ears; ringing or buzzing in ears; swelling of eyes, face, or inside of nose

Signs and symptoms of overdose

Blindness; chest pain; dizziness; double vision; fainting; lightheadedness; rapid or irregular heartbeat; sleepiness

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 occur or progress after you stop taking this medicine:

Blurred vision or change in vision

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