... infection,if you have chronic IBS I have severe stomach pain and when I take antibiotics for chest infection as I have COPD the pain is worse.I also have Reumetoid Athritis Underactive Thyroid ,and I have had a heart attack.I usually have an emergency of antibiotics but they are usually Amoxicillin 500mg but they really give me a lot of stomach pain.I just wanted to know if there is an alternative .