Dette skyldes den alfa- mimetiske virkning af pseudoephedrin, i kombination med andre vasokontriktorer som bromocriptin, pergolid, lisurid, cabergolin, ergotamin, dihydroergotamin eller andre dekongestanter brugt til næsen enten peroralt eller nasalt (phenylpropanolamin, phenylephrin, ephedrin, oxymetazolin, naphazolin...).
This is due to the alpha-mimetic activity of pseudoephedrine in combination with other vasoconstrictors such as bromocripitine, pergolide, lisuride, cabergoline, ergotamine, dihydroergotamine or any other decongestant medicinal product used as a nasal decongestant, either by oral route or by nasal route (phenylpropanolamine, phenylephrine, ephedrine, oxymetazoline, naphazoline…).