A pharmaceutical composition in a form of an orally deliverable liquid
comprises water having in solution therein a pharmaceutically acceptable
water-soluble salt of a tolterodine related compound at a therapeutically
effective concentration in the composition. The composition has a pH of
about 2 to about 6 and further comprises a sweetening agent and an
antimicrobial agent at a concentration that is antimicrobially effective
at the pH of the composition. The composition is useful for treating a
muscarinic receptor mediated disorder, more particularly overactive
bladder, in a subject by orally administering to the subject a
therapeutically effective amount of the composition.