Once opened, how many months can nitroglycerine tablets be used before they must be discarded?

Nitroglycerin tablets, once opened, typically have a shelf life of about six months before they lose their potency and must be discarded. This is due to the fact that nitroglycerin is a volatile compound that can degrade when exposed to light, air, or moisture. The special bottle in which these tablets are stored is designed to protect them from environmental factors, but once opened, the effectiveness decreases over time. It is essential for patients using nitroglycerin to be aware of this timeframe to ensure they are using effective medication for the management of angina or other relevant conditions. The other options suggest shorter durations or imply indefinite usability, which does not align with the established guidelines for the storage and effectiveness of nitroglycerin tablets.