In TB meningitis which drug is not used in the treatment protocol –
**TB Meningitis Treatment Protocol**
**Core Concept**
TB meningitis is a severe and potentially life-threatening complication of tuberculosis (TB) infection, affecting the meninges, the protective membranes surrounding the brain and spinal cord. Effective treatment requires a combination of antibiotics that target the Mycobacterium tuberculosis bacteria.
**Why the Correct Answer is Right**
The first-line treatment for TB meningitis typically includes rifampicin, isoniazid, pyrazinamide, and ethambutol. Streptomycin, an aminoglycoside antibiotic, is not commonly used in the treatment protocol due to its potential to cause ototoxicity (hearing loss) and nephrotoxicity (kidney damage). Additionally, the use of streptomycin in TB meningitis may be associated with a higher risk of hearing loss and balance disturbances.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because rifampicin is a critical component of TB meningitis treatment, providing potent bactericidal activity against M. tuberculosis.
* **Option B:** This option is incorrect because isoniazid is also a key medication in the treatment of TB meningitis, acting by inhibiting the synthesis of mycolic acid in the bacterial cell wall.
* **Option C:** This option is incorrect because pyrazinamide is another essential medication in TB meningitis treatment, exerting bactericidal activity against semi-dormant bacteria within macrophages.
* **Option D:** This option is incorrect because ethambutol is used in combination with other medications to treat TB meningitis, inhibiting the synthesis of the bacterial cell wall.
**Clinical Pearl / High-Yield Fact**
When treating TB meningitis, it's essential to monitor patients for signs of hearing loss and balance disturbances, particularly if streptomycin is used. Regular audiometric testing may be necessary to detect early signs of ototoxicity.
**Correct Answer: D. Ethambutol is used in the treatment protocol of TB meningitis.**