Most common side effect of Penicillin is?

RRB Staff Nurse Kolkata-2015

Pharmacology

Easy

Appeared in: RRB Staff Nurse Kolkata-2015

Explanation

The most common adverse effects of penicillins are allergic or hypersensitivity reactions.
These reactions typically manifest on the skin as urticaria (hives), pruritus (itching), and angioedema.
According to pharmacological texts, allergic reactions occur in 0.7% to 4% of treatment courses, with skin manifestations being the most frequent.
While gastrointestinal upset is also common, hypersensitivity reactions are the most classic and clinically significant adverse effect profile associated with the penicillin drug class.

Option B: Fever can be a symptom of a drug allergy, but it is less common than the characteristic skin rashes and itching associated with penicillin hypersensitivity.
Option C: Renal calculi (kidney stones) are not a recognized side effect of penicillin antibiotics.
Option D: Although gastrointestinal disturbances like nausea, vomiting, and diarrhea are frequent, especially with oral penicillins, hypersensitivity reactions are considered the most hallmark and common type of adverse reaction for the penicillin class as a whole.

Visual 1: Image - A photograph showing a typical maculopapular (morbilliform) drug rash on a patient's torso, illustrating the most common presentation of penicillin hypersensitivity.
Visual 2: Chart - A diagram comparing the common adverse effects of penicillin, showing hypersensitivity reactions (rash, itching) as the most characteristic, followed by gastrointestinal issues.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Adverse effects of Penicillin as background academic context rather than a clinical decision trigger.
A critical nursing responsibility is to assess for a history of penicillin allergy before administering any drug from this class. Ask the patient to describe the specific reaction they had.
Patients with a history of a mild rash may sometimes still receive penicillins, but those with a history of hives, angioedema, or anaphylaxis should not receive penicillins or certain cephalosporins.
Patient education should include instructions to stop the medication and seek medical attention immediately if they develop a rash, hives, swelling of the lips or face, or difficulty breathing.

How to Approach the Question

First, identify the keyword in the question, which is "most common" side effect.
Next, recall the major categories of adverse drug reactions for antibiotics, particularly penicillins. These include hypersensitivity, gastrointestinal, and organ-specific toxicities.
Associate penicillin with its most well-known and clinically significant adverse effect: its potential to cause allergic reactions.
Evaluate the options. 'Rashes with itching' is a direct description of a common hypersensitivity reaction. 'Gastro Intestinal disturbances' is also common but less specific to penicillin's unique risk profile. 'Fever' is less common, and 'Renal Calculi' is incorrect.
Conclude that the hypersensitivity reaction is the most appropriate answer for the "most common" side effect in a clinical and examination context.

Concept Tested & Keywords

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