Our expert says:
Sudafed is a know first-line treatment option with varied results, for priapism (prolonged erection) so may well be the cause of your erectile dysfunction, especially because you were able to obtain a good erection initially. Erectile dysfunction may, however, be the result of a underlying medical problem, eg heart disease, so it would definitely be a good idea to have a check-up if you haven't done so recently.
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