Zostex Tablet

(2 customer reviews)

Zostex, featuring the active ingredient Brivudin, stands as a potent antiviral medication designed to impede the replication of the Varicella-zoster virus, the culprit behind shingles (Herpes zoster). This article aims to provide a detailed exploration of its dosage, contraindications, potential interactions, side effects, and the duration it takes to exhibit its therapeutic effects.

Dosage form

Pack size


125 Mg



Generic Name (Ingredient)

Brivudine 125 Mg

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Dosage and Administration

For optimal results, adults are recommended to take one tablet daily for seven days, ideally at the same time each day. Commencing treatment within 72 hours of the initial skin manifestations or within 48 hours of the appearance of the first blisters is crucial for effective management.


Zostex should be avoided under the following circumstances:

  1. Recent or planned receipt of specific cancer chemotherapy (e.g., Capecitabin, 5-Fluorouracil (5-FU), Tegafur, etc.).
  2. Current or recent treatment with Flucytosin for fungal infection.
  3. Allergy (hypersensitivity) to Brivudin or any other Zostex ingredients.
  4. Pregnancy or breastfeeding.
  5. Individuals under 18 years of age.


A crucial aspect to note is the potential fatal interaction between Zostex (Brivudin) and certain cancer drugs or Flucytosin. Patients must inform their healthcare providers about any ongoing or planned medication to avoid complications.

Side Effects

While Zostex commonly induces nausea in approximately 2% of patients, less frequent side effects (<1%) encompass a decrease in granulocytes, headache, altered blood cell counts (granulocytopenia, anemia, lymphocytosis, monocytosis), elevated liver enzymes, and allergic reactions. Vigilance for side effects is paramount, and any observed symptoms should prompt consultation with a healthcare professional.

Onset of Action

The precise onset of action for Zostex is not explicitly outlined in available sources. However, initiation of treatment within the recommended timeframe suggests the medication may commence its therapeutic effects within this period. Individual variations based on infection severity and overall health necessitate consultation with a healthcare professional for accurate information.

Benefits of Zostex Tablet

Zostex, with its active ingredient Brivudin, offers several advantages:

  1. Effective Against Shingles: Inhibits the replication of the Varicella-zoster virus, addressing shingles effectively.
  2. Early Treatment: Utilized for early shingles treatment in adults with a normal immune system, reducing severity and duration when initiated promptly.
  3. Convenient Dosage: One tablet daily for seven days, ensuring patient adherence to the regimen.

It is crucial to highlight that while Zostex presents these benefits, usage should be under healthcare professional supervision, considering specific contraindications and potential interactions.

Pregnancy and Breastfeeding

Zostex is contraindicated for individuals in these situations. The active ingredient, Brivudin, poses potential harm to the baby, emphasizing the necessity for consultation with a healthcare professional before initiating the medication.


In conclusion, Zostex emerges as a valuable tool in the early treatment of shingles, showcasing efficacy through its active ingredient, Brivudin. Adhering to prescribed dosage and considering contraindications are pivotal for optimal outcomes. As with any medication, vigilant monitoring for side effects and professional guidance ensure a safe and effective therapeutic journey.

Key information:

Attribute Information
Medication Name Zostex
Active Ingredient Brivudin
Recommended Dosage One tablet daily for seven days
Treatment Initiation Window Within 72 hours of initial skin manifestations, or within 48 hours of the appearance of the first blisters
Contraindications Specific cancer chemotherapy, treatment with Flucytosin, allergy to Brivudin or Zostex ingredients, pregnancy or breastfeeding, individuals under 18 years of age
Potential Interactions Potentially fatal interaction with certain cancer drugs or Flucytosin
Common Side Effect Nausea (observed in about 2% of patients)

2 reviews for Zostex Tablet

  1. Ming

    It helps

  2. Ming

    Very good!

    • Medical Guidance Center

      Hello Ming, this is Wikikenko.

      Thank you for your feedback. We’re glad to hear that Wikikenko has been able to help provide useful information. Comments like yours contribute greatly to helping us enhance our resources and better serve the needs of all users. Ensuring patients can access reliable health information is our top priority. Please feel free to reach out if there’s any other way we might continue improving. We appreciate you taking the time to share your thoughts.

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The information on this page is not intended to be a substitute for professional medical advice, diagnosis, or treatment. always seek the advice for your physician or another qualified health provider with any questions you may have regarding a medical condition. Always remember to

  1. Ask your own doctor for medical advice.
  2. Names, brands, and dosage may differ between countries.
  3. When not feeling well, or experiencing side effects always contact your own doctor.


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