A nurse in a clinic receives a telephone call from a client who has tuberculosis and was prescribed rifampin 3 days ago. The client reports, "My saliva and tears are red. What should I do?" Which of the following responses by the nurse is appropriate?

Choice A rationale Rifampin is an antitubercular medication known to cause a harmless reddish-orange discoloration of body fluids, including saliva, tears, urine, and sweat. This is due to the drug's metabolite and is an expected, benign side effect, not an allergic reaction, and does not require discontinuation of the medication. Choice B rationale Stopping the medication due to an allergic reaction is incorrect. The red discoloration is an expected pharmacological effect of rifampin and not an indication of an allergic response, which would typically manifest as rash, itching, or anaphylaxis. Discontinuing the drug unnecessarily would compromise tuberculosis treatment. Choice C rationale Stating the condition will only last a couple of days is incorrect. The discoloration of body fluids will persist as long as the client is taking rifampin due to the continuous presence of the drug and its metabolites. It will resolve only after discontinuation of the medication. Choice D rationale Taking the medication with red meat causing this adverse effect is incorrect. The discoloration is a direct pharmacological action of rifampin on body fluids and is not influenced by dietary intake, such as consuming red meat. This effect is dose-dependent and related to the drug's inherent properties.