Is it dangerous to take 5 hour energy with benadryl ?

My allergies are at their absolute worst right now. Because of the other medications I take there is a limited number of allergy pills that I can take. Out of all the ones I can take benadryl is the only one that gives me relief. But the problem is it makes me really drowsy. I want to drink the 5 hour energy to counteract the drowsiness, would that be unsafe