Zantac is fast acting to offer all day & all night relief & prevention of heartburn & acid indigestion. Adults & children over 16 years of age: Swallow one tablet with water as soon as symptoms occur. If symptoms persist for more than 1 hour another tablet can be taken. Do not take more than 4 tablets in 24 hours. Do not give to persons under the age of 16 years. Contains Ranitidine (as hydrochloride) 75mg. 48 Tablets.