My nephew had a major car accident two years ago. He still has problems resulting from the wreck. He has/is taking Hydrocodone 100 mg & Propox n apap 100 650 tab. My question is "Is it possible that he could OD on these meds either by themselves or together? How concerned should we be? He did have a brain injury and has short term memory loss. So he doesn't always remember what he's already taken.