Question

which of the following drug classes causes bronchial relaxation? anti-sympathomimetic anti-tussive expectorant anticholinergic

Explanation:

To determine the drug class causing bronchial relaxation, we analyze each option:

• Anti - sympathomimetic drugs act against sympathetic stimulation; they don't typically cause bronchial relaxation.
• Anti - tussive drugs are for suppressing cough, not bronchial relaxation.
• Expectorants help in thinning and loosening mucus, not relaxing bronchi.
• Anticholinergic drugs block the action of acetylcholine, which leads to bronchial relaxation (e.g., in conditions like asthma, they are used to dilate bronchi).

Answer:

Anticholinergic