Terramycin is a tetracycline-class agent used in ocular infections.

Terramycin is a tetracycline-class agent used in ocular infections.

• A. Terramycin
• B. Cefazolin
• C. Gentamicin
• D. Ofloxacin

Answer: (A)

Terramycin is oxytetracycline, a tetracycline-class antibiotic used topically for eye infections. Tetracyclines inhibit bacterial protein synthesis by binding to the 30S ribosomal subunit, blocking the attachment of aminoacyl-tRNA and stopping growth (bacteriostatic). This gives broad activity against many Gram-positive organisms and several Gram-negative bacteria commonly seen on the ocular surface, making it a practical choice for ocular infections in horses. The other drugs listed belong to different classes—cefazolin is a cephalosporin (cell wall synthesis inhibitor), gentamicin is an aminoglycoside, and ofloxacin is a fluoroquinolone—so they are not tetracyclines.

Terramycin is oxytetracycline, a tetracycline-class antibiotic used topically for eye infections. Tetracyclines inhibit bacterial protein synthesis by binding to the 30S ribosomal subunit, blocking the attachment of aminoacyl-tRNA and stopping growth (bacteriostatic). This gives broad activity against many Gram-positive organisms and several Gram-negative bacteria commonly seen on the ocular surface, making it a practical choice for ocular infections in horses. The other drugs listed belong to different classes—cefazolin is a cephalosporin (cell wall synthesis inhibitor), gentamicin is an aminoglycoside, and ofloxacin is a fluoroquinolone—so they are not tetracyclines.