Related Experiment Videos
Chloroquine and desethylchloroquine concentrations during regular long-term malaria prophylaxis
Bulletin of the World Health Organization
|January 1, 1987
Summary
This study measured chloroquine and desethylchloroquine blood levels in volunteers on long-term malaria prophylaxis. Current weekly dosages maintain effective concentrations without exceeding safety limits, supporting the established regimen.
Area of Science:
- Pharmacology
- Tropical Medicine
- Analytical Chemistry
Background:
- Long-term malaria prophylaxis relies on maintaining adequate drug concentrations.
- Chloroquine has been a standard prophylactic agent for decades.
- Understanding drug and metabolite levels is crucial for assessing efficacy and safety.
Purpose of the Study:
- To quantify chloroquine and its metabolite desethylchloroquine in healthy volunteers on long-term prophylaxis.
- To evaluate if current dosing regimens achieve therapeutic levels while avoiding toxicity.
- To provide evidence for the continued use of the established chloroquine dosage.
Main Methods:
- Analysis of capillary whole blood samples from 10 healthy adult Swedish volunteers.
- Utilized a high-performance liquid chromatography (HPLC) method for precise drug and metabolite quantification.
- Blood samples were collected post-dose and pre-dose for weekly interval analysis.
Main Results:
- Mean chloroquine and desethylchloroquine concentrations were 1305 nmol/l and 915 nmol/l one day post-dose.
- Pre-dose concentrations were 489 nmol/l and 384 nmol/l, respectively.
- Measured concentrations exceeded minimum inhibitory levels but remained below maximum tolerated levels.
Conclusions:
- The current weekly chloroquine dosage for malaria prophylaxis is effective.
- Established dosing maintains therapeutic drug concentrations within safe limits.
- The long-standing chloroquine prophylaxis dosage recommendation remains appropriate.