petchy said:he has now been on cimetidine since about 6-7 weeks old, and within 24 hours of going on it he was like a new baby! cimetidine is the medication they give to people with stomach ulcers. it reduces the amount of stomach acid that is produced - thereby eliminating the pain from the acid reflux. obviously with babies the dose is TINY compared to the adult dose. ruben is on 0.5ml 4 times a day. the GP prescribed it without any further tests, just by what i told her.