Can i take zantac (ranitidine) while breast feeding ?

Yes: Zantac, ranitidine, is listed as a class B for pregnancy which means it is likely safe but as always you should talk with your doctor and look at how much you need the medicine. In animal studies there were not any findings that were considered serious, that is that it might cause birth defects. Here is a link with more information: http://www.drugs.com/pregnancy/ranitidine.html