Topic: Vitamins· Biomolecules

Among the following, the narrow spectrum antibiotic is :

1. penicillin G

2. ampicillin

3. amoxycillin

4. chloramphenicol

Doubtly Asked 30 Oct 2026 NEET UG 2019 neet Save WhatsApp Report

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Answer: 1. penicillin G

Narrow spectrum antibiotics act on a limited range of bacteria. Penicillin G is mainly effective against gram-positive bacteria, so it is narrow spectrum. Ampicillin, amoxycillin and chloramphenicol act on both gram-positive and gram-negative bacteria (broad spectrum). Answer: option (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Among the following, the narrow spectrum antibiotic is :

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