Pfizer also is creating a huge drug company by combining its Upjohn off-patent branded drug unit with generic pharmaceutical company Mylan, a deal that should close in mid-2020. Viagra should not be taken if you are taking any nitrate-based drug, including nitroglycerin or if you are on any blood pressure or heart medication, as combining Viagra with these drugs can cause a severe drop in blood pressure. Viagra does not take the place of stimulation.

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