Pharmacy Technician Certification Board Practice Exam

Why are nitroglycerin tablets stored in brown bottles?

1. Sensitive to moisture in the air

2. Sensitive to changes in temperature

3. Incompatible with certain plastics

4. Sensitive to light

The correct answer is: Sensitive to light

Nitroglycerin tablets are stored in brown bottles primarily because they are sensitive to light. Light exposure can degrade nitroglycerin, potentially reducing its efficacy and safety. The brown bottle serves as a protective barrier against light, ensuring that the medication remains stable and effective for as long as possible when stored. In the context of the other options, while it is true that some medications can be sensitive to moisture, temperature fluctuations, or certain plastics, those concerns are not the primary reason for the specific choice of packaging for nitroglycerin. The distinct advantage of the brown glass is its ability to provide adequate shielding from light, making it the best choice for preserving the integrity of nitroglycerin tablets.