Its me again! I took Nexium for a while for GERD or Reflux Disease. I don't remember any adverse side effects except what it did to my bank account. My old MD told me I would probably have to take it for the rest of my life. However, I began taking chiropractic treatments and doing gallbladder and Liver Flushes and I haven't needed Nexium or any other medicine for gastric problems. Natural medicine cured what a very expensive medicine barely controlled.
I know your son is an adult and you can't force him to do anything; but I hope the example you are making in doing healthy, natural things for your body will make him more responsive to alternative medicine and natural cures.