I am entering my second month on 25 mg. An amazing difference for me with no side effects. I used to have 10-15 violent coughing events per day. I am now down to one of two. My energy is back, my appetite better , my mucous production less. In short it is all very positive so far. Not to overuse the words, but this indeed has been a miracle drug for me (87 years old and 2 1/2 years since diagnosis at Mayo). Fingers crossed that it continues to work. PCIII