National Dental Examining Board of Canada (NDEB) Practice Exam

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Prepare for the National Dental Examining Board of Canada (NDEB) Test. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Achieve success in your exam!

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Which penicillin is most effective against gram-negative bacteria?

  1. Penicillin G

  2. Ampicillin

  3. Amoxicillin

  4. Penicillin V

The correct answer is: Ampicillin

Whereas Penicillin G, Penicillin V, and Amoxicillin are most effective against gram-positive bacteria, Ampicillin is unique in its effectiveness against both gram-positive and gram-negative bacteria. This is due to its ability to bind to and inhibit the growth of the cell walls in both types of bacteria. Thus, Ampicillin is the best option when targeting gram-negative bacteria.

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