Overview
DESCRIPTION Ranitidine Tablets USP are available for oral administration containing 150 mg or 300 mg of ranitidine. The active ingredient in Ranitidine Tablets USP, 150 mg and 300 mg is Ranitidine hydrochloride (HCl), USP, a histamine H 2 -receptor antagonist. Chemically it is N[2-[[[5-[(dimethylamino)methyl]-2-furanyl] methyl]thio]ethyl]-N´-methyl-2-nitro-1,1-ethenediamine, HCl.
Mechanism of Action
CLINICAL PHARMACOLOGY Ranitidine Tablets are a competitive, reversible inhibitor of the action of histamine at the histamine H 2 -receptors, including receptors on the gastric cells. Ranitidine Tablets do not lower serum Ca++ in hypercalcemic states. Ranitidine Tablets are not an anticholinergic agent. Pharmacokinetics Absorption: Ranitidine Tablets are 50% absorbed after oral administration, compared to an intravenous (IV) injection with mean peak levels of 440 to 545 ng/mL occurring 2 to 3 hours after a 150 mg dose. Absorption is not significantly impaired by the administration of food or antacids. Propantheline slightly delays and increases peak blood levels of ranitidine, probably by delaying gastric emptying and transit time.
Indications
- INDICATIONS AND USAGE Ranitidine Tablets are indicated in: Short- term treatment of active duodenal ulcer. Most patients heal within 4 weeks. Studies available to date have not assessed the safety of Ranitidine in uncomplicated duodenal ulcer for periods of more than 8 weeks. Maintenance therapy for duodenal ulcer patients at reduced dosage after healing of acute ulcers. No placebo- controlled comparative studies have been carried out for periods of longer than 1 year. The treatment of pathological hypersecretory conditions (e.g., Zollinger-Ellison syndrome and systemic mastocytosis).
Common Doses
- 150 mg
- 300 mg
- 100 mg
- 6 g
Dosage
DOSAGE AND ADMINISTRATION Active Duodenal Ulcer: The current recommended adult oral dosage of Ranitidine Tablets for duodenal ulcer is 150 mg twice daily. An alternative dosage of 300 mg once daily after the evening meal or at bedtime can be used for patients in whom dosing convenience is important. The advantages of one treatment regimen compared with the other in a particular patient population have yet to be demonstrated (see Clinical Trials: Active Duodenal Ulcer ).
Contraindications
- CONTRAINDICATIONS Ranitidine Tablets are contraindicated for patients known to have hypersensitivity to the drug or any of the ingredients (see PRECAUTIONS ).
Side Effects
- ADVERSE REACTIONS The following have been reported as events in clinical trials or in the routine management of patients treated with Ranitidine Tablets. The relationship to therapy with Ranitidine Tablets has been unclear in many cases. Headache, sometimes severe, seems to be related to administration of Ranitidine Tablets. Central Nervous System: Rarely, malaise, dizziness, somnolence, insomnia, and vertigo. Rare cases of reversible mental confusion, agitation, depression, and hallucinations have been reported, predominantly in severely ill elderly patients.
Interactions
- No major interactions listed on the FDA label. Always consult a healthcare professional.