Does anyone know where I can purchase pure powdered diphenhydramine (Benadryl) without a prescription? I’ve been using it as a sleep aid. I get very bad insomnia some nights due to work stress. I have an emergency allergic reaction kit in my house that has liquid intramuscular diphenhydramine in it and I’ve been taking a shot as needed before bed. It puts me right out in about a minute. Every time. It’s actually amazing. Taking the equivalent dose in a pill does not have the same effect, even adjusted for time. However, I’ve run out of the liquid and I’m looking to make more. Does anyone know of a reliable lab that manufactures diphenhydramine without a script?