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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.
Pseudoephedrine can be used to make meth. So it can cause excitability in people. In fact some people take it just for the perk up factor even if they don't have allergies or sinus issues. In people like me, it causes rapid heart beat and sleeplessness.