| http://www.w3.org/ns/prov#value | - You may not be able to take these medicines for the following reasons: You are taking other treatments for erectile dysfunction You are taking medicines called nitrates, such as glyceryl trinitrate (GTN) for angina ??? this can lead to a potentially very dangerous drop in blood pressure You take recreational drugs called poppers (amyl nitrate) ??? these may also cause a severe drop in blood pressu
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