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Title: Pharmacokinetic investigation on the therapeutic potential of Artemotil (β-arteether) in Thai patients with severe Plasmodium falciparum malaria
Authors: Qigui Li
Charles B. Lugt
Sornchai Looareesuwan
Srivicha Krudsood
Polrat Wilairatana
Suparp Vannaphan
Kobsiri Chalearmrult
Wilbur K. Milhous
Walter Reed Army Institute of Research
Mahidol University
Keywords: Immunology and Microbiology;Medicine
Issue Date: 1-Dec-2004
Citation: American Journal of Tropical Medicine and Hygiene. Vol.71, No.6 (2004), 723-731
Abstract: Pharmacokinetic data were obtained to evaluate the therapeutic potential of Artemotil (β-arteether) in 56 Thai patients with severe Plasmodium falciparum malaria. Intramuscular administration was given at 1) a low dose of 3.2 mg/kg on day 0 and 1.6 mg/kg/day on days 1-4 and 2) a high dose of 4.8 mg/kg on day 0 at 0 hours, 1.6 mg/kg at 6 hours, and 1.6 mg/kg/day on days 1-4. Cmax values of 63.7 ng/mL at 6.1 hours and 140.8 ng/mL at 5.7 hours were reached in low-dose and high-dose patients, respectively. Drug concentrations decreased slowly with half-lives of 12.5-22.4 hours on day 0 and 31.6-40.7 hours on day 4 for both dosage regimens. Although the maintaining dosage on the last day was much lower than the loading dose on day 0, the area under the curve (AUC) and Cmax on day 4 were significantly increased (2.85-4.55 fold), suggesting drug accumulation in the blood. Dihydroartemisinin (DHA), an active metabolite of Artemotil, was detected in most patients. The mean ratios of DHA and Artemotil were 0.16-0.19 in both dosage regimens for the entire study period. Similar to previous reports, all patients showed a slow response to treatment with mean values of 77.2 hours for the fever clearance time (FCT) and 75.8 hours for the parasite clearance time (PCT) (low dose) and 70.1 hours for the FCT and 64.4 hours for the PCT (high dose). Interestingly, a very rapid response to the treatment was exhibited in patient 151, with an FCT of 4 hours and a PCT of 36 hours, with different pharmacokinetic data from others on day 0. The patient had a very high Cmax (2,407 ng/mL) and AUC (12,259 ng·hr/mL) values without an intramuscular absorption phase on the first day. These values were approximately 21.9 (Cmax) and 2.6 (AUC) times higher than in other patients; this patient may have been to be injected through a vessel at first dosing. In conclusion, the patients treated with the high dosage regimen had higher AUC values and higher antimalarial efficiency (cure rate = 48%) than the low-dose subjects (cure rate = 23%). Despite the high accumulation and longer exposure time (9-11 days) when compared with other artemisinin agents, due to the slow prolonged absorption of Artemotil from injection sites, the two dosage regimens did not show a better therapeutic effects than other artemisinin drugs, including α/β-arteether dissolved in peanut oil used in Indian patients.
ISSN: 00029637
Appears in Collections:Scopus 2001-2005

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