... drug he has breathing problems so bad he can't hardly leave the couch he has some of the other side affects but the one most troubling is the breathing they have done tests to rule out the heart have tests to rule out the lungs he is taking one twice a day they cut the dose to one a day with no changes he takes other prescriptions like nifedipine we are at a loss he is 85 years old is there anyone who may have an idea if it could be the metformin