Bed wetting at 9yrs old.......Desmotabs

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My son has dyspraxia and ADHD. He always bed wets and after trying everything and visiting the clinics etc the doctor has prescribed Desmotabs now he is 9 years old (or will be next month) he has been on them for 2 weeks now - He has 2 x tablets (as recommended by doctor) every night before bed time. Despite being on them for 2 weeks he has still woken up very wet everyday.
Has anyone else tried these? did they work?
Doc says give it a full 3 weeks and if still the same to come back.......