well i couldnt find anything out about it so i would recommend not doing it. just get normal dryl, no need to risk anything when the normal version is readily avaible
Do you.....enjoy diphenhydramine? If you've never done it I suggest you don't. It's horrible. phenylephrine is like epinephrine (adrenaline) but not because epinephrine is like inactive orally. It's an adrenergic receptor agonist (it stimulates adrenaline receptors). So I dunno. Look up the symptoms of alpha-1-adrendergic receptor overstimulation. Probably bad.
benadryl never did much for me except give me cotton mouth and make me feel like i weighed a thousand pounds. dramamine on the other hand has given me some crazy trips