Hey guys so the answer is NO. You can't take the 1ml iv/Im dose of diphenhydramine orally. You would get a terrible stomach pain and little to no desired effect. any questions let me know oh and iv benadryl for people who haven't taken it , iv benadryl forMOST NOT ALL will have u so sleepy your slurring your speech within 15 seconds of injecting in vein! Hard for most to even fight the sleep. I noticed some people it acttually WAKES them up like a red bull ( mainly kids). so if we need person awake we only inject 25 mg in adults iv and 50 mg IM/intramuscular ( in muscle ).... Lemme know if you have any questions