Acetylcysteine vs Bromhexine for Loosening Cough: 18 MCQs with answers

D · It breaks disulfide bonds in mucus glycoproteins.

Acetylcysteine is a chemical mucolytic that cleaves disulfide bridges, directly thinning existing thick mucus.

D · It increases serous bronchial secretion and surfactant.

Bromhexine works through the bronchial glands, increasing watery secretion and surfactant to lower mucus viscosity.

A · Mucolytics

Both are mucoactive agents that loosen mucus; neither suppresses cough nor dilates bronchi.

D · Choice depends on mucus type, patient factors, and goals.

The source declares no universal winner; selection is individualised based on clinical context.

D · Acetylcysteine

Acetylcysteine has a distinctive antidote role in paracetamol overdose, where it replenishes glutathione.

A · True

Acetylcysteine works by breaking disulfide bonds in mucus glycoproteins, while Bromhexine increases serous bronchial secretion and surfactant production.

A · Acetylcysteine, because it chemically cleaves existing mucus.

Acetylcysteine's bond-breaking action works directly on present mucus; bromhexine's effect builds over hours to days via glands.

C · It works by changing gland secretion quality over time.

Bromhexine stimulates bronchial glands to produce more serous secretion and surfactant, a process that builds gradually.

B · Secretions may be trapped in the airways.

Suppressing a productive cough prevents clearance, so loosened secretions can accumulate; mucolytics support clearance instead.

C · Acetylcysteine — breaks disulfide bonds; Bromhexine — increases serous secretion.

Acetylcysteine is the chemical bond-breaker; bromhexine shifts gland secretion toward serous output and surfactant.

B · Bromhexine acts via glands, not by cleaving polymers directly.

Direct polymer cleavage is acetylcysteine's mechanism; bromhexine is better described as a mucoregulator/mucokinetic.

D · Disulfide cross-links between glycoprotein chains

Acetylcysteine donates sulfhydryl groups that reduce disulfide bridges, fragmenting the mucus polymer network.

C · Acetylcysteine, which is the paracetamol overdose antidote.

Only acetylcysteine has the established antidote role in paracetamol overdose; bromhexine does not.

A · Both A and R are true, and R explains A.

The sulfhydryl donation directly reduces disulfide bonds in present mucus, which is exactly why acetylcysteine acts on existing mucus.

C · Bromhexine, because its gland-mediated effect suits gradual regulation.

When gradual regulation is acceptable, bromhexine's slower gland-mediated action is a reasonable fit; acetylcysteine's direct action suits thick tenacious mucus.

A · I and II only

Statement III is false — bromhexine is a mucolytic, not a cough suppressant. Statements I and II are correct.

C · Acetylcysteine, because it chemically breaks disulfide bonds in mucus, providing immediate action on the existing thick mucus.

Acetylcysteine is the best choice for very thick, tenacious mucus because it acts directly on the existing mucus by breaking disulfide bonds, providing rapid thinning. Bromhexine's action builds over time and is less effective for immediate relief in such cases.

D · Acetylcysteine, as it serves both as a mucolytic and an antidote for paracetamol overdose.

Acetylcysteine should be prioritized because it not only acts as a mucolytic to thin mucus but also serves as the antidote for paracetamol overdose, providing a dual benefit for this patient.