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Sudafed (pseudoephedrine) and other decongestants can cause erectile dysfunction (ED) in some men. If you are having trouble getting or maintaining an erection while taking Sudafed, your doctor or pharmacist can recommend a different medication.
So that was a wishy-washy report on the effects of coffee and 3 drugs, 2 actually since ephedrine and pseudoephedrine are basically the same compound. I'm gonna have to say that with about 50,000 different medications on the market, the question is still unanswered.