A nurse is reinforcing discharge teaching with a client who has a new prescription for rifampin. Which of the following information should the nurse include?

A. The client should take this medication on an empty stomach, at least 1 hour before or 2 hours after a meal, to increase its absorption and effectiveness. B. Rifampin can cause harmless discoloration of body fluids, including urine, to a red-orange color. C. Insomnia is not a common side effect of rifampin. D. Unusual hair growth is not typically associated with rifampin use.