What happens when viagra 'expires'?
As a drug sits around, it begins to degrade losing its effectiveness. The drug does not all degrade at the same time but rather over a period of time. The potency begins to decrease. Its result becomes unpredictable. The manufacturer puts an expiration date through which they can guarantee its effectiveness and potency. It will still be good after the expiration date, but you can never know for how long and how effective it will be.
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