Benadryl Allergy Plus Sinus Headache addresses multi symptoms.. For those people who suffer from allergies, Benadryl Allergy Plus Sinus Headache helps to alleviate multiple symptoms. I have used regular Benadryl for many years now when I get occasional seasonal allergy symptoms. Regular Benaydryl helps my sinuses, runny nose, and itchy-wattery eyes. It's fantastic for what it is made for. But once in a while all those symptoms compound and I end up with a very severe headache. Before I found Benadryl Allergy Plus Sinus Headache, I would take regular Benadryl and Tylenol. I always kind of worried about taking them together. But now there is a single product that addresses ALL the symptoms. I feel comfortable and secure in taking this. It works the same as regular Benadryl, and of course, the side effect is extreme drowsiness. If I take this or regular Benadryl, I fall asleep almost instantly. It's fast working on my symptoms, and also knocks me out! But on those days where allergy symptoms are at their worst, this is the best thing for me.