What can i do if my suicidal friend just took 4 benadryl (diphenhydramine) pills. is he going to be okay?

Support: If your friend ingested 4 - 25 mg Benadryl (diphenhydramine) pills it should not cause any significant physical harm. However, if he was doing this as a cry for help or in an attempt to harm himself that is serious. If you are minors, tell his parents. They will need to insure that he gets proper medical/ mental health care. Let your friend know that you care, explain your concerns & encourage him to accept help.