Shelf life of salbutamol in this preparation is:
**Core Concept**
Salbutamol is a short-acting beta-2 adrenergic receptor agonist (SABA) used in the management of acute asthma and chronic obstructive pulmonary disease (COPD). The shelf life of salbutamol is a critical factor in its stability and efficacy.
**Why the Correct Answer is Right**
The correct answer is related to the storage conditions and stability of salbutamol. Salbutamol is a beta-2 agonist that undergoes degradation when exposed to light, heat, or oxygen. The International Conference on Harmonisation (ICH) guidelines recommend that beta-2 agonists like salbutamol should be stored in a refrigerator at a temperature between 2°C and 8°C. The shelf life of salbutamol inhalation solution is typically 28 days when stored in a refrigerator.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
Remember that beta-2 agonists like salbutamol should not be exposed to direct sunlight or high temperatures, as this can lead to degradation and loss of efficacy. Always check the expiration date and storage conditions before using any medication.
**Correct Answer: C. 28 days when stored in a refrigerator.**