Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Mintz on stopping ranitidine: I don't believe there is any concern. Hello, Prilosec contains omeprazole and both pantoprazole and omeprazole belong to the same group. If pantoprazole is not helping you, you can take ranitidine or gelusil after consulting your gastroenterologist. Over a year ago i was given ranitidine for the treatment of GERD. I took my first dose and i started to feel nausea so i went to bed, during the night i started vomiting and not like any vomit i had ever experienced before. i thought nothing of it, until my heart began to race through out the night I am currently on omeprazole AND ranitidine at the same time and it hasn't even touched my acid reflux in the slightest, either of them, so my Dad has paid for me to go private next week cos I am pregnant an really suffering at the moment. Treats and prevents heartburn with acid indigestion. Also treats stomach ulcers, gastroesophageal reflux disease (gerd), and conditions that cause your stomach to make too much acid (such as zollinger-ellison syndrome). This medicine is a histamine h2-blocker. Famotidine is used to treat and prevent ulcers in the stomach and intestines. It also treats conditions in which the stomach produces too much acid, PACKAGE LEAFLET: INFORMATION FOR THE USER RANITIDINE 150 mg FILM-COATED TABLETS RANITIDINE 300 mg FILM-COATED TABLETS (Ranitidine hydrochloride) Ranitidine is another name for Zantac , ask you doctor but you can take 300 mg twice a day of ranitidine. If that is not working try pepcid it is also called famotidine. Acid reflux / indigestion. Losec (Omeprazole) and Zantac (Ranitidine) for acid reflux / indigestion and heartburn. Medicine on prescription from UK pharmacy. User Reviews for Zantac 150. The following information is NOT intended to endorse drugs or recommend therapy. While these reviews might be helpful, they are not a substitute for the expertise, skill, knowledge and judgement of healthcare practitioners in patient care.