Efficacy of salmeterol is increased if it is given along with –
**Core Concept**
Salmeterol is a long-acting beta-2 adrenergic receptor agonist (LABA) used in the management of asthma and chronic obstructive pulmonary disease (COPD). Its efficacy can be enhanced by combining it with other medications that have complementary mechanisms of action.
**Why the Correct Answer is Right**
Salmeterol works by stimulating the beta-2 adrenergic receptors in the bronchial smooth muscles, leading to bronchodilation. However, its effect is short-lived due to the rapid metabolism by enzymes such as cytochrome P450 3A4. Fluticasone, a corticosteroid, is a correct option because it inhibits the expression of these enzymes, thereby increasing the levels and duration of action of salmeterol. This combination is often used in inhalers like Seretide or Advair, which provide a synergistic effect in improving lung function and reducing symptoms in patients with asthma and COPD.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because theophylline, a methylxanthine derivative, has a different mechanism of action and is not commonly used in combination with salmeterol.
**Option B:** This option is incorrect because ipratropium, an anticholinergic agent, has a different mechanism of action and is not typically combined with salmeterol.
**Option C:** This option is incorrect because montelukast, a leukotriene receptor antagonist, has a different mechanism of action and is not commonly used in combination with salmeterol.
**Clinical Pearl / High-Yield Fact**
When combining medications like salmeterol and fluticasone, it's essential to remember that the addition of a corticosteroid can mask the underlying inflammation, making it more challenging to diagnose and treat conditions like asthma. Regular monitoring of lung function and symptoms is crucial in such cases.
**Correct Answer: D. Fluticasone.**