The difference between cimetidine and ranitidine is that cimetidine is used for the treatment of relief of stomach pain, heartburn sensation (heartburn), and acid reflux caused by excess stomach acid. It significantly inhibits diurnal basic gastric acid secretion, as well as gastric acid secretion induced by food, histamine, pentagastrin, caffeine and insulin. Oral absorption is good, not affected by food and acid production, and the peak blood concentration is reached within 3 hours after taking the drug. The main rely on lazy liver excretion.

Ranitidine's role as an H2 receptor inhibitor, with inhibition of gastric acid secretion, oral absorption through the gastrointestinal tract after rapid. It is used in the treatment of relief of stomach pain, heartburn sensation (heartburn), acid reflux caused by excessive stomach acid. Mainly excreted with urine via kidney.

Both are inhibiting the secretion of gastric acid, but the principle is different, the main absorption and excretion of different routes. The two are the same class of drugs, but Ranitidine is a new generation of drugs, a generation better than a generation this is inevitable, the market Ranitidine dominant, people are too many have recognized the drug, but the old generation of drugs or the existence of its own advantages.