Indications

Vonoprazan is indicated for: Gastric ulcer, duodenal ulcer, reflux esophagitis, prevention of recurrence of gastric or duodenal ulcer during low-dose aspirin administration, prevention of recurrence of gastric or duodenal ulcer during NSAID administration. Adjunct to Helicobacter pylori eradication in the following: Gastric ulcer, duodenal ulcer, gastric mucosa-associated lymphatic tissue (MALT) lymphoma, idiopathic thrombocytopenic purpura, the stomach after endoscopic resection of early-stage gastric cancer or Helicobacter pylori gastritis.

Composition

Pharmacology

Vonoprazan is a potassium competitive acid blocker (P-CAB) and does not require activation by acid. It inhibits H + , K + -ATPase in a reversible and potassium-competitive manner. Vonoprazan has a strong basicity and resides on the acid production site of gastric parietal cells for a long time, thereby inhibiting gastric acid production. Vonoprazan exerts a strong inhibitory effect on formation of mucosal damage in upper part of the gastrointestinal tract.

Dosage & Administration

Gastric ulcer and duodenal ulcer : The usual adult dose for oral use is 20 mg of Vonoprazan administered orally once daily an 8-week treatment for gastric ulcer and a 6-week treatment for duodenal ulcer. Reflux esophagitis : The usual adult dose for oral use is 20 mg of Vonoprazan administered once daily for a total of 4 weeks of treatment. If that dosing proves insufficient, the administration should be extended, but for no longer than 8 weeks of treatment. For the maintenance therapy of reflux esophagitis showing recurrence and recrudescence, the dose for oral use is 10mg of Vonoprazan once daily. However, when the efficacy is inadequate, the dosage may be increase up to 20 mg of Vonoprazan once daily. Prevention of recurrence of gastric or duodenal ulcer during low-dose aspirin administration : The usual adult dose is one tablet of 10 mg of Vonoprazan administered orally once daily. Prevention of recurrence of gastric or duodenal ulcer during non-steroidal anti-inflammatory drug (NSAID) : administration The usual adult dose is one tablet of 10 mg of Vonoprazan administered orally once daily. Adjunct to Helicobacter pylori eradication : For adults, the following three-drug regimen should be administered orally at the same time twice daily for seven days: 20 mg of Vonoprazan, 750 mg of amoxicillin hydrate and 200 mg of clarithromycin. The dose of clarithromycin may be increased as clinically warranted. However, dosage should not exceed 400 mg twice daily. If Helicobacter pylori eradication with a three-drug regimen comprising a proton pump inhibitor, amoxicillin hydrate and clarithromycin has been unsuccessful, as an alternative treatment, adults should be administered the following three drugs orally twice daily for seven days: 20 mg of Vonoprazan, 750 mg of amoxicillin hydrate and 250 mg of metronidazole.

Contraindications

Vonoprazan is contraindicated in: Patients with hypersensitivity to Vonoprazan or to any excipient of the product. Patients receiving atazanavir sulphate, nelfinavir or rilpivirine hydrochloride.

Side Effects

Following side effects have been reported with the use of Vonoprazan: Diarrhea, constipation, drug hypersensitivity (including anaphylactic shock), drug eruption, urticaria, hepatotoxicity, jaundice, rash, nausea, abdominal distension, gamma-glutamyl transferase increased, AST increased, Liver function test abnormal, ALT increased, ALP increased, LDH increased, y-GPT increased, edema and eosinophilia

Pregnancy & Lactation

Vonoprazan should be used in pregnant women or women having possibility of being pregnant only if the expected therapeutic benefit is thought to outweigh any possible risk. It is advisable to avoid the administration of Vonoprazan to nursing mothers. However, when the administration is indispensable, nursing should be discontinued.

Precautions & Warnings

At the treatment, the course of the disease should closely be observed and the minimum therapeutic necessity should be used according to the disease condition. In the long-term, treatment with Vonoprazan, close observation by such means as endoscopy should be made. In the maintenance of healing of reflux esophagitis, Vonoprazan should be administered only to the patients who repeat recurrence and recrudescence of the condition. Administration to the patients who do not necessitate maintenance of healing should be avoided. When the healing is maintained over a long period and when there is no risk of recurrence, the dose reduction to a dose of 10mg from a dose 20mg, or suspension of administration should be considered.

Therapeutic Class

Potassium competitive acid blocker

Storage Conditions

Store below 30°C, in a cool and dry place. Keep away from light. Keep all the medicine out of the reach of children.