Chloroquine (Oral Route, Intramuscular 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. When this medicine is used for short periods of time, side effects usually are rare. However, when it is used for a long time and/or in high doses, side effects are more likely to occur and may be serious.

Check with your doctor immediately if any of the following side effects occur:

• Blurred vision
• Change in vision
• Eye pain
• Loss of vision

• Black, tarry stools
• Blood in urine or stools
• Convulsions (seizures)
• Cough or hoarseness
• Feeling faint or lightheaded
• Fever or chills
• Increased muscle weakness
• Lower back or side pain
• Mood or other mental changes
• Painful or difficult urination
• Pinpoint red spots on skin
• Ringing or buzzing in ears or any loss of hearing
• Sore throat
• Unusual bleeding or bruising
• Unusual tiredness or weakness

• Drowsiness
• Headache
• Increased excitability

Note: The side effects in the Less Common category above may also occur or get worse after you stop taking this medicine.

Some 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. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Diarrhea
• Difficulty in seeing to read
• Headache
• Itching (more common in black patients)
• Loss of appetite
• Nausea or vomiting
• Stomach cramps or pain

• Bleaching of hair or increased hair loss
• Blue-black discoloration of skin, fingernails, or inside of mouth
• Skin rash

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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