A nurse is reinforcing discharge instructions for a client who has asthma and is about to start using tiotropium. Which of the following side effects should the nurse include in the teaching?

A. Dry oral mucous membranes: Tiotropium is an anticholinergic (long-acting muscarinic antagonist) and commonly causes dry mouth. B. White coating in the mouth: More associated with inhaled corticosteroids (oral candidiasis), not anticholinergic bronchodilators. C. Tremors: Tremors are a side effect of beta-agonist bronchodilators (e.g., albuterol), not tiotropium. D. Nausea: Not a common or characteristic side effect of tiotropium.