Chloroquine Phosphate Dosage

Malaria prevention

Ideally, your provider will have you start Chloroquine Phosphate 2 weeks before you travel to areas with malaria. Usually, you'll continue taking it while there and for 2 months after your return.

• Adults: The typical dose is 500 mg by mouth weekly on the same day each week.
• Children: Your child's provider will calculate the dose based on your child's body weight. It's typically given by mouth weekly on the same day each week.

If you're not able to start Chloroquine Phosphate 2 weeks before traveling, your provider will ask you take 2 doses of Chloroquine Phosphate (500 mg for adults and weight-based dose for children) 6 hours apart on the first day you start the medication.

Malaria treatment

• Adults: The typical dose is 1 gram by mouth, followed by 500 mg 6 to 8 hours later. After that, you'll take 500 mg once daily for the next two days.
• Children: Your child's provider will calculate the dose based on your child's body weight. Typically, your child will take a higher loading dose for their first dose. Then, they'll take a lower maintenance dose at 6 hours, 24 hours, and 36 hours after their loading dose.

If you have certain malaria parasites (P. vivax and P. ovale), your provider might also have you take another medication along with Chloroquine Phosphate to really get rid of the parasites.

Extraintestinal amebiasis

• Adults: The typical dose is 1 gram by mouth daily for 2 days, then 500 mg daily for at least 2 to 3 weeks. Your provider might have you take another medication along with Chloroquine Phosphate.