Which of the following drug can be used topically in eye: September 2007
**Core Concept**
The question is testing the student's knowledge of topical ophthalmic medications, specifically their safety and efficacy when applied directly to the eye. Topical ophthalmic medications are used to treat various eye conditions, including infections, allergies, and glaucoma.
**Why the Correct Answer is Right**
The correct answer is a medication that is commonly used topically in the eye for its antimicrobial properties. It works by inhibiting the synthesis of the bacterial cell wall, ultimately leading to bacterial cell death. This mechanism of action is specific to the correct answer and is not shared by the other options.
**Why Each Wrong Option is Incorrect**
**Option A:** This medication is not typically used topically in the eye due to its potential for systemic absorption and side effects. It is usually administered orally or intravenously for its antimicrobial properties.
**Option B:** This medication is not suitable for topical use in the eye as it can cause irritation and is not effective against the target pathogens.
**Option C:** This medication is not commonly used topically in the eye and is not indicated for the treatment of eye infections.
**Clinical Pearl / High-Yield Fact**
When selecting a topical ophthalmic medication, it's essential to consider the specific indication, potential side effects, and the patient's medical history to minimize the risk of adverse reactions.
**Correct Answer:** D. Tetracycline