I'm very drug sensitive and Zantac didn't kill me so you are probably safe. I have COPD and it did make me a little short of breath but I didn't notice any effect on my neiropathy. I only took it for a month though.

I don't remember if I have posted this before but was wondering if you are drinking cholorinated water? I had bladder problems for 25 years, was told the only treatment was lifetime antibioltics, but I have had almost no problems since I put a Pur filter on my faucet. Most of my problems were due to inflammation and I'm not sure if that would play a role in susecptibility to infection but it might be something to try..if nothing else your coffee will taste better.