Posted 12/29/2015 5:04 PM (GMT -7)
This is really more of a question for your doctor or a pharmacist. I was taking 150 mg of Zantac twice a day without any issues. My father, was taking 300 mg of Zantac twice a day, but he had an extreme issue with his stomach which involved internal bleeding. The drug, though well tolerated by many people, still might have some side effects.
You should probably start off with a 75 mg pill and see how your body reacts. It takes about 15-25 minutes for it have it's full effect, so you'll know fairly quickly how it affects you, if at all.