Can i take zantec and tums (calcium carbonate) at the same time? one zantec this morning and one this evening.

Yes: It is safe to take zantac (ranitidine) and Tums at the same time.

Zantac (ranitidine) ; Tums: Zantac (ranitidine) works by blocking the amount of acid produced by your stomach. Tums works by neutralizing any acid that is there. Or in another works, they work differently and won't conflict with each other. Feel free to take both as long as you make sure that your OB is ok with you taking zantac (ranitidine).