Zantac 75 contains ranitidine. For the symptomatic relief of heartburn, indigestion, acid indigestion and hyperacidity and for the prevention of acid indigestion, indigestion, hyperacidity and heartburn associated with consuming food and drink. Always read the leaflet. Zantac 75 Relief contains ranitidine. For the symptomatic relief of heartburn, indigestion, acid indigestion and hyperacidity. Always read the leaflet.