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Prevention of PCP: Oral: 1500 mg once daily with food.
Treatment of mild-to-moderate PCP: Oral: 750 mg twice daily with food for 21 days.
Supplied: Oral Suspension: 750 mg/5 ml.
Extraintestinal amebiasis: Oral: 1 g/day (600 mg base) for 2 days followed by 500 mg/day (300 mg base) for at least 2-3 weeks.
Rheumatoid arthritis, lupus erythematosus (unlabeled uses): Oral: 250 mg (150 mg base) once daily; reduce dosage following maximal response (taper to discontinue after response in lupus); generally requires 3-6 weeks. Note: Not considered first-line agent.
Renal Dosing: Clcr <10 mL/min: Administer 50% of dose.
Supplied: Tablet: 250 mg [equivalent to 150 mg base];
Dosing (Adults): Treatment of susceptible infections: Oral: 650 mg 3 times/day after meals for 20 days; not to exceed 2 g/day
Supplied: 210 mg, 650 mg tablet.
Dosing (Adults): Dose expressed as mg of mefloquine HCL:
Malaria treatment (mild to moderate infection): Oral: 5 tablets (1250 mg) as a single dose. Take with food and at least 8 oz of water. If clinical improvement is not seen within 48-72 hours, an alternative therapy should be used for retreatment.
Malaria prophylaxis: Oral: 1 tablet (250 mg) weekly starting 1 week before, arrival in endemic area, continuing weekly during travel and for 4 weeks after leaving endemic area. Take with food and at least 8 oz of water.
Supplied: Tablet, as hydrochloride: 250 mg [equivalent to 228 mg base]
Take with meals to decrease adverse GI effects. Drug has a bitter taste.
Dosing (Adults): Dosage expressed as mg of base (15 mg base = 26.3 mg primaquine phosphate).
Treatment of malaria: To decrease risk of delayed primary attacks and prevent relapse: Oral: 15 mg/day (base) once daily for 14 days or 45 mg base once weekly for 8 weeks. CDC treatment recommendations: Begin therapy during last 2 weeks of, or following a course of, suppression with chloroquine or a comparable drug. Note: A second course (30 mg/day) for 14 days may be required in patients with relapse. Higher initial doses (30 mg/day) have also been used following exposure in S.E. Asia or Somalia.
Prevention of malaria (unlabeled use): Initiate prior to travel and continue for 7 days after departure from malaria-endemic area: Oral: 30 mg once daily.
Pneumonia due to Pneumocystis carinii (unlabeled use): Oral: 30 mg once daily for 21 days (in conjunction with clindamycin)
Supplied: Tablet, as phosphate: 26.3 mg [15 mg base]
Malaria chemoprophylaxis (for areas of chloroquine-resistant P. falciparum): Oral: Begin prophylaxis 2 weeks before entering endemic area: 25 mg once weekly. Dosage should be continued for all age groups for at least 6-10 weeks after leaving endemic areas.
Chloroquine-resistant P. falciparummalaria (when used in conjunction with quinine and sulfadiazine): Oral: 25 mg twice daily for 3 days.
Toxoplasmosis: Oral: 50-75 mg/day together with 1-4 g of a sulfonamide for 1-3 weeks depending on patient's tolerance and response, then reduce dose by 50% and continue for 4-5 weeks or 25-50 mg/day for 3-4 weeks.
Supplied: 25 mg tablet.
Dosing (Adults): Treatment of acute malaria attacks: Oral: A single dose of the following number of Fansidar® tablets is used in sequence with quinine or alone: 3 tablets
Malaria prophylaxis: A single dose should be carried for self-treatment in the event of febrile illness when medical attention is not immediately available: Oral: 3 tablets
Supplied: Tablet: Sulfadoxine 500 mg and pyrimethamine 25 mg
Dosing (Adults): Treatment of chloroquine-resistant malaria: Oral: 650 mg every 8 hours for 3-7 days with tetracycline.
Suppression of malaria: Oral: 325 mg twice daily and continued for 6 weeks after exposure.
Babesiosis: Oral: 650 mg every 6-8 hours for 7 days.
Leg cramps: Oral: 200-300 mg at bedtime.
Other medications — The following medications have also been used for nocturnal leg cramps with variable success:
1) Diphenhydramine (Benadryl) 12.5 to 50 mg nightly
Renal Dosing: Clcr 10-50 mL/minute: Administer every 8-12 hours or 75% of normal dose. Clcr <10 mL/minute: Administer every 24 hours or 30% to 50% of normal dose. Not removed by hemo- or peritoneal dialysis; dose for Clcr <10 mL/minute.
Supplied: Capsule, as sulfate: 200 mg, 325 mg.
National Institutes of Health, U.S. National Library of Medicine, DailyMed Database.
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