I will reply from a different point of view and that is from a father of a 17 year old son with the DDF508. He was diagnosed at 4 months. We were blessed you see, our CF doctor now also happened to run a pediatric clinic. My son was a patient and my son's doctor recognized the signs pretty fast. My wife's sister also had CF and my wife could tell you stories much of the same thing you are going through.
This is what I am hearing from forum members, my son, and my sister-n-law before she passed away at age 27. When they are 17, they are much like any other 17 year old. They want to be normal and treated just like any other normal person. They also feel a bit "It will never happen to me" attitude. My mother-n-law if she were here with me writing this could share with you some pretty good stories of my wife's sister taking her medication, literally putting it in her mouth in front of her mother and then spitting them in the trash the moment she turned around, my wife never said a word. They had a bond that only sisters have. I have seen my son get so frustrated with his breathing treatment as he was watching TV I peeked around the corner and watched him pour it out onto the carpet and then continue with the treatment only to finish seconds later. Did it piss me off that he just wasted medication that I have fought with the insurance companies tooth and nail for him to get? The medication that would normally cost $4500 a month but we get buy with a very small copay of $250 a month, Hell yes I was livid!! Went to my wife and she calmed me down before I spoke with him.
Here is the nuts and bolts, you have come to the right place for people that have been there and currently going through the same thing you are. My son did great when he was younger, at age 15-16 it was horrible. We would have bottles and bottles of full enzyme bottles at the house. Bill the poster 'Printer' above me does speak some truth, if he does have some stomach issues he will understand that the medication does indeed help him. The most important thing here is this. Is he still gaining weight? Does he spend a lot of time in the bathroom having bowel movements. At 17, he is not going to offer that information up freely. He is just going through a phase right now. He will hit a point in his life that he will decide, that he "DOES" want to live a long life and that their is a lot to live for in this world. He will want to live to the ripe old age of 73 and beyond like Bill here. (Sorry Bill wasn't calling you old) well kinda... but you do give us hope that our kids with CF can live this long. Heck if he hits 73 I will be 97 lol.
Here is the point of all this rambling, he will be 18 before long. You will even have less say about 'telling him' to take his medication. Stop beating yourself up. Its not your fault that he doesn't do what he is told. Yes, he will feel ramifications if he doesn't do what he is told. He is at that age where you can only encourage him like '
Wldhrtd1 ' said above. Put the enzymes on the counter, write a note under it and just say "I love you, Mom" if he takes them he takes them, if he doesn't he doesn't simple as that. Enzymes are the least of your worries to be honest 'if he is gaining weight'. His lungs are the most important in my opinion. You haven't told us if he needs to take breathing treatments. Does he do them? Or does he just not want too?
Here is my latest tactic and it has worked a bit better. Not 100% never, but at least its better. Some of you are not religious and thats ok. I go to church when I can and I am no saint, but I do pray a lot about my son and other things. I put this in Gods hands. I decided months ago to not utter one single word about my son't medications both enzymes and breathing treatment and his tube feedings he does into his G-button at night. You know what? He is doing them on his own now. I think he just wanted us to stop harping him. HE wanted to make that decision. Also he needed to speak with friends and some of them told him he was looking too thin and he sure was coughing a lot etc. I think that got to him more than me telling him daily every day to do this and that. Sometimes your son may need to hear from other people his own age or advice from others, other than yourself. I know its hard to hear as a parent but it may work.