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. 1982 Jun;13(6):865-70.
doi: 10.1111/j.1365-2125.1982.tb01880.x.

Prazosin first dose phenomenon during combined treatment with a beta-adrenoceptor blocker in hypertensive patients

P Seideman, A Grahnén, K Haglund, B Lindström, C Von Bahr

Prazosin first dose phenomenon during combined treatment with a beta-adrenoceptor blocker in hypertensive patients

P Seideman et al. Br J Clin Pharmacol. 1982 Jun.

Abstract

1 The antihypertensive effect of prazosin has been studied in three groups of hypertensive patients. 2 The drug caused a significant reduction of blood pressure both as monotherapy and combined with alprenolol. 3 The effect of prazosin on blood pressure was more marked at the first dose and especially in combination with alprenolol. 4 No pharmacokinetic interaction between prazosin and alprenolol was observed. 5 Prazosin exhibits an exaggerated first dose effect together with alprenolol. Smaller starting doses of prazosin in combination therapy with beta-adrenoceptor blockers are warranted.

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