Why are cimetidine and 'ranitidine better antacids than sodium hydrogen carbonate or magnesium or aluminium hydroxide?

Explanation

Sodium. bicarbonate or magnesium or aluminium hydroxide can make the stomảch alkaline and trigger the production of even more acid which muy cause serious ulcers. Cimetidine and Ranitidine are drugs which prevent the tnteraction of histamine (which stimulates secretion of HCl) with receptors present in stomach wall, 'This results in release. of lesser amount of acid.