Which antitubercular medication must be taken on an empty stomach according to standard practice?

Which antitubercular medication must be taken on an empty stomach according to standard practice?

• A. Rifampin
• B. Ethambutol
• C. Isoniazid
• D. Rifabutin

Answer: (C)

Isoniazid must be taken on an empty stomach because its absorption is significantly reduced when taken with food. When you eat, the drug’s entry into the bloodstream drops, leading to lower peak levels and less overall exposure, which can compromise effectiveness. To maintain reliable therapeutic levels, guidelines specify taking isoniazid about an hour before meals or two hours after meals. This helps ensure the medication reaches the concentrations needed to effectively kill bacteria and prevent resistance. Other antituberculars have different absorption and tolerability profiles, so the empty-stomach instruction is specifically tied to isoniazid.

Isoniazid must be taken on an empty stomach because its absorption is significantly reduced when taken with food. When you eat, the drug’s entry into the bloodstream drops, leading to lower peak levels and less overall exposure, which can compromise effectiveness. To maintain reliable therapeutic levels, guidelines specify taking isoniazid about an hour before meals or two hours after meals. This helps ensure the medication reaches the concentrations needed to effectively kill bacteria and prevent resistance. Other antituberculars have different absorption and tolerability profiles, so the empty-stomach instruction is specifically tied to isoniazid.