Activity of aclidinium bromide, a new long-acting muscarinic antagonist: a phase I study.

Aim: Aclidinium bromide is a muscarinic antagonist in development for the treatment of chronic obstructive pulmonary disease (COPD). This phase I trial in healthy subjects investigated the bronchodilator activity of aclidinium and its ability to reduce methacholine-induced bronchoconstriction.

Methods: This double-blind, partial-crossover study randomized 12 subjects to treatment with single doses of aclidinium (50, 300 or 600 microg) or placebo.