Quinine (Oral Route)

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Side Effects

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:

• Diarrhea
• Nausea
• Stomach cramps or pain
• Vomiting

• Anxiety
• Behavior change, similar to drunkenness
• Black, tarry stools
• Blood in urine or stools
• Blurred vision or change in 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

• 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

Get emergency help immediately if any of the following symptoms of overdose occur:

• Blindness
• Blurred vision or change in vision
• Chest pain
• Dizziness
• Double vision
• Fainting
• Lightheadedness
• Rapid or irregular heartbeat
• Sleepiness

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

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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