Cimetidine (Tagamet, Tagamet HB) may increase the effects of chloroquine, which could
lead to toxicity. Do not take cimetidine without first talking to your doctor.
Kaolin and magnesium trisilicate may decrease the effects of chloroquine. These ingredients
can be found in products such as Kaopectate Advanced Formula, Parepectolin, K-Pek, K-C,
Kaodene Non-Narcotic, Kao-Spen, Gaviscon, and others.
Drugs other than those listed here may also interact with chloroquine. Do not take any other
prescription or over-the-counter medicines, including vitamins, minerals, and herbal products,
without frist talking to your doctor.
Stop taking chloroquine and seek emergency medical attention if you experience an
allergic reaction (flushing; swelling of the lips, tongue, or face; difficulty breathing; closing of the
throat; vision problems; rash; itching; or fever).
Other, less serious side effects may be more likely to occur. Continue to take chloroquine
and talk to your doctor if you experience
visual disturbances such as blurred vision, misty vision, and
difficulty focusing;
hearing loss or ringing in the ears;
diarrhea, nausea, stomach pain or upset, vomiting, or loss
of appetite;
muscle weakness; or
a rash.
Side effects other than those listed here may also occur. Talk to your
doctor about any side effect that seems unusual or that is especially bothersome.
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