Archive for the ‘primaquine’ Tag

What are the salt & base equivalents for antimalarials?   Leave a comment

by convention, quinine dosage is given in salt units while its derivatives are usually given in base units, except for mefloquine which is complicated. The highlighted units below are the ones in common use. Remember to state clearly whether you are referring to the base or salt when writing the prescription! This discussion applies to oral formulations only.

Quinine sulphate: 300mg salt = 250mg base

Chloroquine phosphate: 150mg base = 250mg salt

Hydroxychloroquine: 155mg base = 200mg salt

Mefloquine hydrochloride: 250mg salt = 228mg base (in the United States)
(however, in some countries mefloquine is available as 250mg base which = 274mg salt; in these countries I presume that “250mg mefloquine” refers to the base formulation, and patients receive a 9.6% higher dosage than their counterparts elsewhere. But, most internationally-recognised publications refer to the 250mg salt formulation available in the US.)

Amodiaquine hydrochloride: 200mg base = 260mg salt

Primaquine phosphate: 15mg base = 26.3mg salt
 

Ref:

  1. White NJ. The Treatment of Malaria. N Engl J Med 1996 Sep 12;335(11):800-806.
  2. Freedman DO. Malaria Prevention in Short-Term Travelers. N Engl J Med 2008 Aug 7;359(6);603-12. Table 3, Drug Regimes for Prophylaxis Against Malaria; p.608.
  3. Lariam package insert (Roche – US), rev Sep 2008 (PDF file)
  4. Drugs.com (Archived) [Internet]. c2000-2009 [revised 2001 Jan 24; cited 2009 May 8]. Available from:
    http://www.drugs.com/mmx/mefloquine-hydrochloride.html#citec00139613