Congratulations for being so conscientious about your medications prior to surgery. It is important to understand that medications taken before and after surgery may have a significant effect on the operation. In your case, the use of Midol and melatonin should be fine. Midol has acetaminophen or Tylenol in it which does not significantly affect bleeding, etc. Melatonin has no real perioperative complications of note. Of course, I strongly suggest you talk to your surgeon about this and let them know.It is imperative that you seek the advice of a plastic surgeon who is certified by the American Board of Plastic Surgery and has extensive experience in buttock augmentation. I wish you the best. Dr. Gabbay.