Ranitidine generally refers to ranitidine hydrochloride, which is an H2 receptor inhibitor with the effect of inhibiting gastric acid secretion. Side effects commonly include nausea, constipation, fatigue, headache, dizziness, etc. Side effects on renal function, gonadal function and central nervous system are mild; a few patients may cause mild hepatic impairment. The common dosage forms of Ranitidine Hydrochloride are capsules, tablets, injection, etc. Ranitidine Hydrochloride capsules and Ranitidine Hydrochloride tablets are mainly used for relieving stomach pain, heartburn sensation (heartburn), acid reflux and other conditions caused by excessive stomach acid. Ranitidine hydrochloride for injection is used for peptic ulcer bleeding, diffuse mucosal lesion bleeding, anastomotic ulcer bleeding, gastric surgery to prevent re-bleeding; acute gastric mucosal damage complicated by stress and aspirin-induced acute gastric mucosal injury; prevention of bleeding under stress in severe diseases; prevention of acid reflux combined with aspiration pneumonia in patients with general anesthesia or postoperative and debilitating coma. It should be noted that patients who are allergic to ranitidine hydrochloride are prohibited, children under 8 years of age are prohibited, pregnant and lactating women are prohibited, elderly patients and patients with hepatic and renal insufficiency should be cautious. If you need to use Ranitidine Hydrochloride, it is recommended that you consult a professional doctor and follow the doctor’s instructions for standardized treatment, and not blindly use the drug on your own.