Zantac Zantac Zantac is a potent medicine that is used to reduce the acid production from stomach and as a result help in prevention or healing of stomach and duodenal ulcers. This medicine has been in use for may years and is rather well tolerated. It comes in Intravenous or oral tablets.
Intravenous form is used three times a day and when an immediate effect of medicine is needed.
Oral tablets are used twice a day and for a period of times lasting from a few days to weeks.