Please make sure your husband eats something before taking the antibiotic, ( if it won't hurt) and if he is taking other meds, could they be interacting with each other? I was taking Dexilant 60 mg daily and after awhile they were causing me some problems, so the doc said that perhaps he was "over" medicating me, so we went to Prevacid over the counter. If you are in Indiana, the Allergy/Asthma doc that I go to, is very good in Fort Wayne. It is depressing to get the word that one has lung issues, but I was in my early 30's when told that I had a heart syndrome. Thought that my world would come crashing down, but that was 40 years ago, and the diagnosis hasn't kept me from doing anything. Same when told about the lung issues. Take heart in knowing that a Higher Power has us in His care. Blessings to you and your husband.