What is Isoniazid also known as?

• A. Rifampin
• B. INH
• C. SMZ
• D. TMP

Answer: (B)

Isoniazid is commonly known as INH, which stands for Isosazid - hence, the abbreviation aptly represents the drug's name. INH is a key antibiotic in the treatment of tuberculosis, particularly used in conjunction with other antitubercular medications to prevent the development of drug resistance. Its mechanism of action involves inhibiting the synthesis of mycolic acids, essential components of the bacterial cell wall in mycobacteria.

The other choices refer to different antimicrobials: Rifampin is a separate medication used primarily for tuberculosis and some bacterial infections, while SMZ and TMP are components of the combination antibiotic sulfamethoxazole/trimethoprim used to treat various bacterial infections. Thus, while they may be important in antimicrobial therapy, they do not serve as alternative names for Isoniazid.