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Dosage

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 increased 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, the dosage should not exceed 400 mg twice daily. Suppose Helicobacter pylori eradication with a three-drug regimen comprising a proton pump inhibitor, amoxicillin hydrate, and clarithromycin has been unsuccessful, as an alternative treatment. In that case, 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. * Take the medicine as per the doctor’s advice.

Administration

Vonoprazan can be taken without regard to food or the timing of food. Use in the elderly: Since physiological functions such as hepatic or renal function are decreased in elderly patients in general, Vonoprazan should be carefully administered. Use in children less than 18 years of age: The safety and efficacy of Vonoprazan in children and adolescents have not been established. Therefore, the administration of Vonoprazan is not recommended in children and adolescents below 18 years of age. * Take the medicine as per the doctor’s advice.

Contraindications

Vonoprazan is contraindicated in: Patients with hypersensitivity to Vonoprazan or any excipient of the product—patients receiving atazanavir sulfate, 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

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 patients who repeat recurrence and recrudescence of the condition. Administration to patients who do not necessitate the 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 of 20mg, or suspension of administration should be considered.

Overdose Effects

There is no experience of overdose with Vonoprazan. Vonoprazan is not removed from the circulation by hemodialysis. If an overdose occurs, treatment should be symptomatic and supportive.

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.

Brief Description

Indications

Vonoprazan is indicated for Gastric ulcers, duodenal ulcers, reflux esophagitis, prevention of recurrence of gastric or duodenal ulcer during low-dose aspirin administration and 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.

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 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 robust inhibitory effect on the formation of mucosal damage in the upper part of the gastrointestinal tract.