I think you mean Sudafed. Sudafed is pseudophedrin, which is a great decongestant and used to make meth. In most states, you have to go up to the counter and ask for it, as well as supply ID and sign a form promising not to do anything illegal with it. Benadryl is diphenhydramine, which is just an antihistamine, and you can totally get in bottles (in the states). I tend to always have both on hand in case of an allergy attack. Granted, I'm more likely to reach for the Sudafed than the Benadryl. Benadryl has the side effect of intense drowsiness (I guess you can't sneeze if you're in a coma). I also buy a year's supply of Zyrtec and benadryl at Costco. It might seem like a "waste" but when you suffer from bad allergies, it really isn't.

I'm a long time pollen allergy sufferer living in the hell that is South Florida. I know my allergy meds.