Which drug is used to reduce oral and respiratory secretions?

AIIMS Raipur NO- 2019 (shift 3rd)

Pharmacology

Easy

Appeared in: AIIMS Raipur NO- 2019 (shift 3rd)

Explanation

Anticholinergic drugs are the primary class used as preanesthetic medication to reduce salivary and bronchial secretions, making surgery safer.
They function as antimuscarinics, blocking the action of the neurotransmitter acetylcholine at receptors in the salivary and bronchial glands, which directly inhibits mucus and saliva production.
Commonly used examples include Glycopyrrolate, Atropine, and Scopolamine, which are chosen for their potent antisecretory effects.

Option B: Antihistamines are primarily used for treating allergic reactions. While some older antihistamines have drying (anticholinergic) side effects, they are not the first-line drug class selected specifically for this purpose.
Option C: Antibiotics are antimicrobial agents used to treat or prevent bacterial infections. They have no direct physiological mechanism to reduce oral or respiratory secretions.
Option D: Diuretics act on the kidneys to increase the excretion of water and sodium in the urine. They are used to manage conditions like hypertension and edema, and do not affect salivary or respiratory glands.

Clinical Relevance

Nursing practice connection: Knowing Pharmacology of drugs used to reduce bodily secretions helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses frequently administer anticholinergics like glycopyrrolate pre-operatively. It is a critical nursing responsibility to monitor for common side effects such as significant dry mouth (xerostomia), tachycardia, and urinary retention.
Patient education is key. Nurses should inform patients that they will experience a dry mouth and reassure them that this is an expected effect of the medication.
What if? If the patient has a history of narrow-angle glaucoma or benign prostatic hyperplasia (BPH), the nurse must hold the anticholinergic medication and notify the physician. These drugs can dangerously increase intraocular pressure and worsen urinary retention.

How to Approach the Question

First, identify the core physiological action requested by the question: reducing oral and respiratory secretions.
Next, analyze the primary mechanism of action for each drug class provided in the options.
Recall that the parasympathetic nervous system, mediated by acetylcholine, stimulates secretions ('rest and digest'). Therefore, a drug that blocks this system (an anticholinergic) would reduce secretions.
Evaluate the other options: Antihistamines target histamine for allergies, Antibiotics target bacteria, and Diuretics target the kidneys for fluid removal.
Eliminate the distractors as their primary functions do not match the question's requirement.
Conclude that Anticholinergics are the correct class of drugs specifically used for their antisecretory effects.

Concept Tested & Keywords

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E6 Pharmacology KD Tripathi Essentials 9e Part 2 pp. 61-63, 60-62