Ipratropium bromide used in Bronchial asthma, is
**Core Concept**
Ipratropium bromide is an anticholinergic medication used in the management of bronchial asthma and chronic obstructive pulmonary disease (COPD). It acts by inhibiting the **parasympathetic nervous system**, which causes bronchoconstriction. This is achieved through its action on **muscarinic receptors**.
**Why the Correct Answer is Right**
Ipratropium bromide is a **quaternary ammonium compound** that acts as an antimuscarinic agent, competing with **acetylcholine** for binding sites on **muscarinic receptors** in the lungs, thereby preventing bronchoconstriction. This leads to relaxation of airway smooth muscles and increased airway diameter, making it easier to breathe.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because ipratropium bromide does not act as a beta-2 agonist.
**Option B:** Incorrect as it is not a corticosteroid.
**Option C:** Incorrect because it is not a methylxanthine.
**Clinical Pearl / High-Yield Fact**
Ipratropium bromide is often used in combination with **beta-2 agonists** for additive benefit in asthma and COPD management.
**Correct Answer:** D. Anticholinergic.