<s>[INST] Hi, my 21 year old daughter is takes 1 2 mg dilaudid for pain associated with acl/meniscus surgery about 10 days ago. She also takes 2 benadryl and a promethazine (for nausea and to help sleep). Her aunt gave her 10 MG melatonin from GNC to help her sleep. Is this ok to take or is that too much? Initially after her surgery she was taking 2 - 4 dilaudids (2 mg each). Thanks! [/INST] Hello and Welcome to ‘Ask A Doctor’ service.I have reviewed your query and here is my advice.There should be no problem with the melatonin and her other medicines. Although she may be a little drowsy the next morning if she takes it along with the promethazine.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. Ralph Chambers </s>