I have been perscribed ranitidine which is the generic name of ausran and zantac (they are brand names it should be written on the box the actual drug name. Ranitidine must be safe as my GP prescribed it for me in this pregnancy and in my last, I am a nurse and it is categorised as B1 which just means that only a limited number of women have taken it during pregnancy but studies have shown that in that small amount of women it was safe and lab tests showed it was safe. It is up to you though whether you take it or not. Maybe check it with your GP.