Product image of Imvanex (Modified Vaccinia Ankara – Bavarian Nordic Live Virus) supplied by GNH India

Imvanex

Active Ingredient:
Modified Vaccinia Ankara – Bavarian Nordic Live Virus
Origin:
EU

Imvanex (Modified Vaccinia Ankara – Bavarian Nordic Live Virus)

Modified Vaccinia Ankara (MVA), the active ingredient in Imvanex, is a live attenuated vaccine presented as a 0.5 mL lyophilized powder for reconstitution for subcutaneous use. It prevents smallpox and monkeypox in individuals at risk.

GNH India supplies Imvanex as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Bavarian Nordic A/S

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Indications & Clinical Uses

Imvanex is a live attenuated viral vaccine used for prophylaxis against orthopoxvirus infections.

  • Smallpox: provides immunity to prevent infection with variola virus.
  • Monkeypox: induces protection against monkeypox virus exposure.
  • Pre‑exposure prophylaxis for high‑risk groups: offers protection before potential orthopoxvirus exposure.

How It Works

  • Imvanex contains non‑replicating Modified Vaccinia Ankara virus particles that present viral antigens to the immune system. The antigens stimulate both humoral (antibody) and cellular (T‑cell) responses, establishing immunity without causing disease, thereby protecting against subsequent exposure to related orthopoxviruses.

Side Effects

Common Side Effects

  • Injection site pain: mild to moderate discomfort at the injection site.
  • Redness or swelling: localized erythema or edema.
  • Fever: transient low‑grade temperature rise.
  • Headache: mild to moderate headache.
  • Fatigue: temporary tiredness.
  • Myalgia: muscle aches.

Serious or Rare Side Effects

  • Anaphylaxis: severe allergic reaction requiring immediate medical attention.
  • Myocarditis: inflammation of the heart muscle, rare but serious.
  • Encephalitis: inflammation of the brain, extremely rare.
  • Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
  • Guillain‑Barré syndrome: rare peripheral neuropathy.
  • Thrombocytopenia: low platelet count, potentially leading to bleeding.

Precautions & Warnings

Before administering Imvanex, consider the following precautions.

  • Immunocompromised patients: avoid use in individuals with severe immune deficiency.
  • Skin conditions: contraindicated in persons with eczema, atopic dermatitis, or other exfoliative skin diseases.
  • Acute illness: postpone vaccination if the patient has a fever or acute infection.
  • Pregnancy: safety not established; use only if potential benefits outweigh risks.
  • Breastfeeding: limited data; assess risk‑benefit before use.
  • Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Avoid Interactions

Imvanex may interact with other medical interventions as follows.

Major Interactions (Avoid)

  • Concurrent live vaccines: avoid administering other live vaccines within four weeks.
  • High‑dose corticosteroids: may reduce vaccine efficacy and increase risk of infection.
  • Chemotherapy or radiotherapy: immunosuppression can diminish immune response.

Moderate Interactions (Monitor Closely)

  • Immunomodulatory agents (e.g., biologics): monitor for adequate seroconversion.
  • Antiviral medications: may theoretically affect vaccine virus, though clinical relevance is low.
  • Diagnostic tests using live virus: schedule appropriately to avoid interference.

Frequently Asked Questions

Imvanex is indicated for the prevention of smallpox and monkeypox. It is administered to individuals at risk of exposure to these orthopoxviruses, providing protective immunity through a single subcutaneous dose.

Modified Vaccinia Ankara (MVA) is a non‑replicating virus that displays orthopoxvirus antigens to the immune system. This triggers both antibody production and T‑cell responses, establishing immunity without causing disease.

The prescribed dose is determined by the treating physician. Typically, a single 0.5 mL dose of reconstituted vaccine is given subcutaneously, but the exact regimen may vary based on clinical judgment.

Safety data in pregnancy and lactation are limited. Use is only recommended when the potential benefit justifies any possible risk to the mother or infant, and should be discussed with a healthcare professional.

To order Imvanex, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India works with hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, cold‑chain shipping details and necessary import documentation.

Unlike traditional replicating vaccinia vaccines, Imvanex uses a non‑replicating MVA strain, offering a better safety profile, especially for immunocompromised individuals. Efficacy in preventing orthopoxvirus infection remains comparable, while the risk of serious vaccine‑related complications is reduced.

Imvanex must be stored refrigerated at 2‑8 °C. Keep the vials in their original packaging, protect from light, and avoid freezing or shaking. Once reconstituted, use the vaccine promptly according to the product’s instructions.

After reconstitution, Imvanex is given as a single subcutaneous injection, typically in the upper arm or thigh. The administration should be performed by a qualified healthcare professional using aseptic technique.

Serious adverse events include anaphylaxis, myocarditis, encephalitis, severe skin reactions such as Stevens‑Johnson syndrome, and rare neurological disorders. Patients should be monitored after vaccination and seek immediate medical care if severe symptoms develop.

Imvanex is contraindicated in individuals with severe immunodeficiency, active eczema or other exfoliative skin conditions, and those with known hypersensitivity to any vaccine component. Caution is also advised for pregnant or breastfeeding women and persons receiving high‑dose immunosuppressive therapy.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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