Vonofix 20mg Tablet

✔️ Pharmacology / How Vonoprazan Works

Vonoprazan belongs to the potassium-competitive acid blocker (P-CAB) class. Unlike conventional proton pump inhibitors, it does not require activation by gastric acid.

It works by reversibly and competitively inhibiting the H⁺/K⁺-ATPase proton pump in gastric parietal cells. By blocking the final step of gastric acid secretion, Vonoprazan produces potent and sustained suppression of stomach acid production.

Because Vonoprazan is strongly basic and accumulates at the site of acid secretion, it can maintain significant inhibition of gastric acid production and support healing of acid-related damage in the upper gastrointestinal tract.

✔️ Side Effects:

• Diarrhea
• Constipation
• Nausea
• Abdominal distension or bloating
• Skin rash
• Urticaria (hives)
• Drug eruption
• Hypersensitivity reactions
• Eosinophilia
• Edema
• Increased liver enzymes
• Abnormal liver-function tests
• Increased AST
• Increased ALT
• Increased ALP
• Increased LDH
• Increased gamma-glutamyl transferase (GGT)

✔️ Dosage & Administration

Vonoprazan may be taken with or without food, and its administration does not need to be specifically timed around meals.

Gastric Ulcer

The usual adult dose is:

20 mg once daily for 8 weeks.

Duodenal Ulcer

The usual adult dose is:

20 mg once daily for 6 weeks.

Reflux Esophagitis

The usual adult dose is:

20 mg once daily for 4 weeks.

If adequate healing is not achieved, treatment may be continued for a longer period, but generally not beyond 8 weeks.

Maintenance Treatment of Reflux Esophagitis

For patients with recurrent reflux esophagitis who require maintenance therapy:

10 mg once daily is generally recommended.

If the response is inadequate, the dose may be increased to:

20 mg once daily.

Long-term maintenance therapy should be reserved for patients who experience recurrent disease and genuinely require continued acid suppression.

Prevention of Ulcer Recurrence During Low-Dose Aspirin Therapy

The usual adult dose is:

10 mg once daily.

Prevention of Ulcer Recurrence During NSAID Therapy

The usual adult dose is:

10 mg once daily.

H. pylori Eradication Therapy

Vonoprazan is used in combination with antibiotics for H. pylori eradication.

Initial Three-Drug Regimen

The following medicines are taken twice daily for 7 days:

• Vonoprazan 20 mg
• Amoxicillin hydrate 750 mg
• Clarithromycin 200 mg

The clarithromycin dose may be increased to 400 mg twice daily when clinically appropriate, but should not exceed this amount.

Alternative Three-Drug Regimen

If previous H. pylori eradication therapy using a proton pump inhibitor, amoxicillin, and clarithromycin has failed, an alternative regimen may be used:

• Vonoprazan 20 mg
• Amoxicillin hydrate 750 mg
• Metronidazole 250 mg

These medicines are administered twice daily for 7 days.

The complete H. pylori treatment regimen should be followed exactly as prescribed by the physician.

Use in Elderly Patients

Older patients may have reduced liver or kidney function and may therefore require careful monitoring during treatment. Vonoprazan should be used cautiously in elderly individuals according to their overall health and clinical condition.

Use in Children

The safety and effectiveness of Vonoprazan in children and adolescents under 18 years of age have not been established. Therefore, its use in this age group is generally not recommended unless specifically directed by a specialist.

✔️ Pregnancy & Lactation

Vonoprazan should be used during pregnancy only when the potential benefits clearly outweigh the possible risks, as adequate controlled human data are limited.

If you are pregnant, planning pregnancy, or breastfeeding, consult your doctor before taking this medicine. The effects of Vonoprazan on a breastfed infant have not been sufficiently established.

✔️ Interaction

Vonoprazan can interact with certain medicines and should not be combined with some antiretroviral agents, including atazanavir, nelfinavir, and rilpivirine, because changes in gastric acidity may affect their absorption and effectiveness.

Always inform your doctor or pharmacist about all prescription medicines, over-the-counter products, vitamins, and supplements you are taking before starting Vonoprazan.

✔️ Vonoprazan should not be used in patients with:

• Known hypersensitivity to Vonoprazan or any ingredient in the formulation
• Concurrent treatment with atazanavir sulfate
• Concurrent treatment with nelfinavir
• Concurrent treatment with rilpivirine hydrochloride

✔️ Precautions & Warnings

Treatment should be given for the shortest duration necessary and at the lowest effective dose appropriate for the patient's condition.

During prolonged treatment, the patient's clinical condition should be monitored regularly, and investigations such as endoscopy may be considered when clinically indicated.

For maintenance treatment of reflux esophagitis:

• Vonoprazan should generally be reserved for patients with recurrent or repeatedly worsening reflux esophagitis.
• Long-term maintenance should be avoided in patients who do not require continued therapy.
• If healing remains stable for an extended period and the risk of recurrence becomes low, the doctor may consider reducing the dose from 20 mg to 10 mg daily or discontinuing treatment.

Patients should inform their doctor about any persistent gastrointestinal symptoms, unexplained weight loss, difficulty swallowing, vomiting blood, or black stools.

✔️ Storage:

• Store below 30°C.
• Keep in a cool and dry place.
• Protect from light and moisture.
• Keep the medicine in its original packaging.
• Keep out of reach and sight of children.