how long for benadryl to work
Best Answer: Its also in Benadryl FYI. It all depends on metabolism and when you last ate. Its different for everyone. It can take 20 minutes, it can take an hour and a half. Taking more won't help, dosages between 150mg and 850mg can get you high, so don't take too much if you don't want that to happen. It becomes a deliriant/hallucinogen at those dosages.