Reasons why men discontinue a medication that successfully addresses their erectile dysfunction have been investigated often. A recent study adds few new reasons for discontinuation, but does report which medical conditions result in men discontinuing due to PDE5 inhibitors not being able to restore their erectile function.
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Conaglen, H., Conaglen, J. Why stop a good thing? Discontinuing PDE5 inhibitors. Nat Rev Urol 9, 483–485 (2012). https://doi.org/10.1038/nrurol.2012.165
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DOI: https://doi.org/10.1038/nrurol.2012.165