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Antimicrobial Agents and Chemotherapy, April 2000, p. 972-977, Vol. 44, No. 4
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Antimalarial Bioavailability and Disposition of Artesunate in Acute Falciparum Malaria

Paul Newton,1,2 Yupin Suputtamongkol,3 Paktiya Teja-Isavadharm,4 Sasithon Pukrittayakamee,1 V Navaratnam,5 Imelda Bates,6 and Nicholas White1,2,*

Faculty of Tropical Medicine, Mahidol University,1 Department of Medicine, Siriraj Hospital,3 and Department of Immunology and Medicine, Armed Forces Research Institute of Medical Sciences,4 Bangkok, Thailand; Centre for Tropical Medicine, Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Headington, Oxford,2 and Liverpool School of Tropical Medicine, Liverpool,6 United Kingdom; and National Centre for Drug Research, Universiti Sains Malaysia, Penang, Malaysia5

Received 8 March 1999/Returned for modification 25 August 1999/Accepted 8 January 2000

The pharmacokinetic properties of oral and intravenous artesunate (2 mg/kg of body weight) were studied in 19 adult patients with acute uncomplicated Plasmodium falciparum malaria by using a randomized crossover design. A sensitive bioassay was used to measure the antimalarial activity in plasma which results from artesunate and its principal metabolite, dihydroartemisinin. The oral study was repeated with 15 patients during convalescence. The mean absolute oral bioavailability of the antimalarial agent in patients with acute malaria was 61% (95% confidence interval [CI], 52 to 70%). The absorption and elimination of oral artesunate were rapid, with a mean elimination half-life of antimalarial activity of 43 min (95% CI, 33 to 53 min). Following oral administration to patients with acute falciparum malaria, peak antimalarial activity in plasma and the area under the plasma concentration-time curve were approximately double those during convalescence and the apparent volume of distribution and clearance were approximately half those during convalescence (P <=  0.005). Acute malaria is associated with a significant reduction in the clearance of artesunate-associated antimalarial activity.

* Corresponding author. Mailing address: Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok 10400, Thailand. Phone: (66) 2 246 0832. Fax: (66) 2 246 7795. E-mail: fnnjw{at}diamond.mahidol.ac.th.

Antimicrobial Agents and Chemotherapy, April 2000, p. 972-977, Vol. 44, No. 4
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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