Unless you are taking chloroquine to treat malaria or liver disease caused by protozoa, use of this medicine is not recommended during pregnancy. Chloroquine passes into breast milk. Chloroquine has not been reported to cause problems in nursing babies. However, babies and children are especially sensitive to the effects of chloroquine. The amount in breast milk is not enough to prevent the infant from getting malaria.
Children are especially sensitive to the effects of chloroquine.
This may increase the chance of side effects during treatment. Overdose is especially dangerous in children. Children should avoid traveling to areas where there is a chance of getting malaria, unless they can take antimalarial medicines that are more effective than chloroquine. Therefore, it may not be known whether they work exactly the same way they do in younger adults or if they cause different side effects or problems in older people. There is no specific information comparing use of chloroquine in the elderly with use in other age groups.