Pharmacokinetics of Metronidazole in pregnant women.

Pharmacokinetic characteristics of metronidazole were studied in 19 pregnant women with Trichomoniasis urogenitalis who had been hospitalized for legal abortion. All patients received 250 mg or 1.0 g metronidazole (Vagimid) per os in a single or multiple dose. Peak levels were reached 1-2 h after application. Mean serum levels of metronidazole were somewhat lower in gravidae than those in nonpregnant women. The mean elimination half-life values were 5.7 and 7.7 h after intake of 250 mg and 1.0 g metronidazole, respectively. As suggested by our pharmacokinetic results, the dosage regimen for treatment of anaerobic bacteria infection or parasitic infection in pregnant women can be the same as in nonpregnant patients.