Prevention of malaria: For adults, the dose of chloroquine is usually 500 mg once a week, taken on exactly the same day every week. To prevent malaria, start taking the tablets 2 weeks before leaving for an area where malaria is a risk and continue taking the tablets for 4 weeks after your return. Children's doses are based on body weight.
Treatment of malaria: For adults, treatment usually begins with a 1 g (1000 mg) dose followed by 500 mg after 6 to 8 hours. This is followed by a single dose of 500 mg on each of 2 consecutive days. This makes for a 3-day total dose of 2.5 g. Children's doses are based on body weight.
Chloroquine may be taken either before or after meals.
Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
It is important to take this medication exactly as prescribed by the doctor. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Store this medication at room temperature, protect it from light and moisture, and keep it out of the reach of children.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.