Metronidazole is commonly used to treat?

IGIMS Staff Nurse - 2018

Pharmacology

Easy

Appeared in: IGIMS Staff Nurse - 2018

Explanation

Metronidazole is a first-line drug for treating amoebic dysentery, a severe form of diarrhea with blood and mucus caused by the protozoan Entamoeba histolytica.
Its effectiveness stems from its ability to kill anaerobic organisms, including protozoa like E. histolytica and Giardia lamblia, as well as anaerobic bacteria.
While 'diarrhea' is a broad symptom, 'dysentery' refers to a specific type of inflammatory intestinal infection for which Metronidazole is a primary and cornerstone treatment.

Option A: Typhoid fever is caused by the bacterium Salmonella typhi. Metronidazole is not effective against this organism.
Option B: Cholera is caused by Vibrio cholerae. Metronidazole has no role in its treatment.
Option D: Diarrhea is a general symptom, not a specific disease. Metronidazole is not a broad-spectrum anti-diarrheal agent and would be ineffective for the most common causes, such as viruses.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological treatment of gastrointestinal infections, specifically the use of Metronidazole as background academic context rather than a clinical decision trigger.
A critical nursing intervention is to educate patients taking Metronidazole to completely avoid alcohol during treatment and for at least 48 hours after the last dose. Consuming alcohol can cause a severe disulfiram-like reaction, including flushing, headache, nausea, vomiting, and abdominal cramps.
Nurses should monitor for side effects such as a metallic taste in the mouth, nausea, and, with long-term use, peripheral neuropathy.
What if? If a patient with dysentery does not improve with Metronidazole, the cause might be bacterial (e.g., Shigella) rather than amoebic. The nurse should anticipate a change in antibiotics to something like ciprofloxacin or azithromycin after further diagnostic tests.

How to Approach the Question

First, identify the drug in the question: Metronidazole.
Recall the drug's class and spectrum of activity. Metronidazole is a nitroimidazole antibiotic and antiprotozoal, highly effective against anaerobic bacteria and protozoa.
Analyze the options, which are all gastrointestinal conditions.
Evaluate each option against Metronidazole's spectrum. Typhoid (Salmonella) and Cholera (Vibrio) are caused by bacteria not typically treated with Metronidazole.
Compare 'Dysentery' and 'Diarrhea'. 'Diarrhea' is a very general symptom, while 'Dysentery' is a more specific inflammatory condition.
Recognize that amoebic dysentery is a classic and primary indication for Metronidazole, making 'Dysentery' the best and most specific answer.

Concept Tested & Keywords

Concept Tested: Pharmacological treatment of gastrointestinal infections, specifically the use of Metronidazole.
Stem keywords: Metronidazole, treat
Lead-in keywords: commonly used to

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