Dear friend, welcome to HCM.
(dry) can occur with the category of drugs like cardace. so, on advice of your doctor it can be changed to another category. also lung congestion of heart failure
can give cough, apart from classic bronchitis/ respiratory infections.
pl. consult your physician and get treated accordingly. if 2Decho had cardiac LV dysfunction, failure should be ruled out.
I hope to have guided you in right direction.
take care and keep me posted on your progress.
good luck !