My daughter wasn't diagnosed until age 14, it only took about 2-3 months to fall into a routine for her.... after that I never had to ask her if she had done her meds or not, she just figured out what time she needed to get up and or stay up to get it done....so for us it just sort of happened naturally. For several years we shared the responsibility of cleaning the nebs, then by the time she was 17 she started doing it herself. She didn't take on the responsibility of ordering her own meds until very recently though and that is only because she did move out and has her own health insurance now.
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<br />My son is a little different story... he is soon to be 22 and just started treatments about 9 months ago. He also is a high function autistic and he still lives at home. I do have to remind him to do his medicine (usually only his first treatment of the day), but that isn't really any different than all the other things I have to remind him to do (eat, shower etc) and or do for him because of his autism. He goes to bed later than me and he will always do his 2nd treatment by himself though... so that means he gets his Pumozyme, Hypertonic Saline and vest going by himself (I still wash all the cups) But he too has learned on his own that he feels better when he doesn't skip treatments and tries to do it without being reminded.
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<br />So I guess for us, I didn't really "do" anything magical, we just sort of fell into a routine and the kids learned that if they didn't do their treatments, their lungs produce more mucus and they don't feel as well. I'm sure it would have been harder to manage if they didn't cooperate so well

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<br />Another thing I guess I did do to help get them organized is pick a place for all the supplies and extra medications to be so they can tell when they are running low on something or know where to get more meds when one runs out etc..... perhaps if you are not already doing something like this... setting up everything in it's place and going over it with him prior to "handing over" the responsibility to him would help.... give him the tools to manage it for himself and he will be more likely to succeed at doing it. You might also consider staging things out... give him one or two things to manage on his own that he hasn't done before....don't throw it all at him at one time.