title: Absence of a pharmacokinetic interaction between losartan and hydrochlorothiazide.
abstract: To support the use of a combination of losartan, a highly specific and selective AT1 angiotensin II receptor antagonist, and hydrochlorothiazide for treatment of hypertension, a pharmacokinetic drug interaction study was conducted. In this open-label, randomized, three-period, crossover study, patients with mild to moderate hypertension received a 12.5-mg tablet of hydrochlorothiazide, a 50-mg losartan tablet, or a combination tablet of 12.5 mg of hydrochlorothiazide and 50 mg of losartan for 7 days. Twelve patients (age range, 35-55 years; mean age, 44 years) were allocated to treatment. Drug interactions were evaluated by comparing the 24-hour area under the concentration-time curve (AUC24) for losartan and its active metabolite, E-3174, when losartan (50 mg) was given alone or in combination with 12.5 mg hydrochlorothiazide. The urinary recovery over the 24-hour period of hydrochlorothiazide was compared for hydrochlorothiazide (12.5 mg) given alone or in combination with 50 mg losartan. A clinically significant interaction was defined as a treatment difference of more than 35%. There was no evidence of a clinically significant effect of hydrochlorothiazide on the pharmacokinetics of losartan or E-3174, as the geometric mean AUC24 ratio (90% confidence interval [CI]) was 1.02 (0.95, 1.09) for losartan and 1.02 (0.96, 1.09) for E-3174. Based on urinary recovery over a 24-hour period of hydrochlorothiazide, losartan did not affect the pharmacokinetics of hydrochlorothiazide, as the geometric mean ratio of urinary hydrochlorothiazide recovery (90% CI) was 0.898 (0.79, 1.20). There was a minor (17%) decrease in the AUC24 of hydrochlorothiazide after administration of the combination tablet. Coadministration of hydrochlorothiazide and losartan was well tolerated.
authors: Department of Clinical Pharmacology, Merck Research Laboratories, West Point, Pennsylvania 19486, USA.
authors: J B
authors: JB
authors: McCrea
authors: M W
authors: MW
authors: Lo
authors: L
authors: L
authors: Tomasko
authors: C C
authors: CC
authors: Lin
authors: J Y
authors: JY
authors: Hsieh
authors: N L
authors: NL
authors: Capra
authors: M R
authors: MR
authors: Goldberg
mesh_terms: D000328:Adult; D000959:Antihypertensive Agents / Q000493:pharmacokinetics*; D001713:Biphenyl Compounds / Q000008:administration & dosage / Q000493:pharmacokinetics*; D018592:Cross-Over Studies; D004232:Diuretics; D004347:Drug Interactions; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D006852:Hydrochlorothiazide / Q000008:administration & dosage / Q000493:pharmacokinetics*; D006973:Hypertension / Q000188:drug therapy*; D007093:Imidazoles / Q000008:administration & dosage / Q000493:pharmacokinetics*; D019808:Losartan; D008297:Male; D008875:Middle Aged; D049993:Sodium Chloride Symporter Inhibitors / Q000493:pharmacokinetics*; D013777:Tetrazoles / Q000008:administration & dosage / Q000493:pharmacokinetics*
chemical_list: D000959:Antihypertensive Agents; D001713:Biphenyl Compounds; D004232:Diuretics; D007093:Imidazoles; D049993:Sodium Chloride Symporter Inhibitors; D013777:Tetrazoles; D006852:Hydrochlorothiazide; D019808:Losartan