Abstract: 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.