Should sublingual nitroglycerin (SL NTG) be discarded 6 months after being opened?

Should sublingual nitroglycerin (SL NTG) be discarded 6 months after being opened?

Many of us were taught that SL NTG tabs (Nitrostat, etc) are easily degraded...and to recommend replacing them every 6 months.

But there's good evidence that SL NTG stays potent right up until the exp date on the bottle...even if it's been opened.

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