Which medication is part of the initial RIPE regimen for active tuberculosis?

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Multiple Choice

Which medication is part of the initial RIPE regimen for active tuberculosis?

Isoniazid is part of the initial RIPE regimen for drug-susceptible active tuberculosis. RIPE stands for Rifampin, Isoniazid, Pyrazinamide, and Ethambutol—the four first-line drugs used together in the intensive phase of therapy. Isoniazid works by inhibiting mycolic acid synthesis, a critical component of the mycobacterial cell wall, making it bactericidal against actively dividing TB bacteria. Using it in combination with the other three agents rapidly reduces bacterial load and helps prevent the development of resistance. In practice, this initial four-drug phase is typically given for about two months, followed by a continuation phase with isoniazid and rifampin for several more months if the TB is susceptible. It’s important to monitor for hepatotoxicity and neuropathy (often prevented with pyridoxine/vitamin B6) and to be mindful of drug interactions, such as rifampin inducing liver enzymes and affecting the levels of other medications. Ciprofloxacin, amoxicillin, and doxycycline are not part of the standard initial regimen for drug-susceptible TB; ciprofloxacin is used mainly in resistant TB or when first-line drugs cannot be used, while amoxicillin and doxycycline do not effectively treat TB.

Isoniazid is part of the initial RIPE regimen for drug-susceptible active tuberculosis. RIPE stands for Rifampin, Isoniazid, Pyrazinamide, and Ethambutol—the four first-line drugs used together in the intensive phase of therapy. Isoniazid works by inhibiting mycolic acid synthesis, a critical component of the mycobacterial cell wall, making it bactericidal against actively dividing TB bacteria. Using it in combination with the other three agents rapidly reduces bacterial load and helps prevent the development of resistance.

In practice, this initial four-drug phase is typically given for about two months, followed by a continuation phase with isoniazid and rifampin for several more months if the TB is susceptible. It’s important to monitor for hepatotoxicity and neuropathy (often prevented with pyridoxine/vitamin B6) and to be mindful of drug interactions, such as rifampin inducing liver enzymes and affecting the levels of other medications.

Ciprofloxacin, amoxicillin, and doxycycline are not part of the standard initial regimen for drug-susceptible TB; ciprofloxacin is used mainly in resistant TB or when first-line drugs cannot be used, while amoxicillin and doxycycline do not effectively treat TB.

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