A nurse is teaching a client who has a new prescription for nitrofurantoin. Which of the following information should the nurse include in the teaching?

A. Brown-colored urine is an expected harmless side effect of nitrofurantoin and does not need to be reported. B. Nitrofurantoin is an antibiotic used for urinary tract infections; it does not relieve peripheral nerve pain. C. Some formulations of nitrofurantoin, especially extended-release capsules, should not be crushed because this can affect absorption and efficacy. D. Nitrofurantoin can cause pulmonary toxicity, including cough, dyspnea, or chest pain. Clients should notify the provider immediately if respiratory symptoms develop.