Should sublingual nitroglycerin (SL NTG) tablets be discarded 6 months after opening the bottle?

Should sublingual nitroglycerin (SL NTG) tablets be discarded 6 months after opening the bottle?

Many of us were taught that SL NTG (Nitrostat, etc) is easily degraded...and should be replaced every 6 months.

But these tablets actually stay potent until the expiration date on the bottle...even if the bottle has been opened frequently.

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