Bell's Ranitidine 75mg Tablets Bell's Ranitidine 75mg Tablets provide effective relief from the burning sensation in the stomach & chest caused by heartburn, indigestion, acid indigestion & hyperacidity (too much acid) for up to 12 hours. The active ingredient, ranitidine, belongs to a group of medicines called H2-antagonists & works by preventing your stomach from producing too much acid.