Influvac Tetra

Influenza virus vaccine, the active ingredient in Influvac Tetra, is a vaccine presented as a formulation for intramuscular, subcutaneous use. It prevents influenza infection in children, adults and elderly populations during seasonal outbreaks.

GNH USA supplies Influvac Tetra as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Influvac Tetra is a quadrivalent influenza vaccine used to protect against seasonal influenza viruses. - Seasonal influenza (all ages): induces immunity against the four virus strains contained in the vaccine, reducing the risk of infection. - High‑risk groups (elderly, chronic disease patients): lowers the incidence of severe flu‑related complications. - Pregnant women (second and third trimester): helps protect both mother and newborn from influenza infection.

Influvac Tetra may cause local and systemic reactions following injection.

Common Side Effects: - Injection site pain: mild to moderate discomfort at the injection site. - Redness or swelling: transient erythema and edema around the site. - Low‑grade fever: temporary rise in body temperature. - Headache: mild to moderate headache within 24‑48 hours. - Myalgia: muscle aches that resolve spontaneously. - Fatigue: short‑term tiredness after vaccination.

Serious or Rare Side Effects: - Anaphylaxis: severe allergic reaction requiring immediate medical attention. - Guillain‑Barré syndrome: rare neurological disorder that may develop weeks after vaccination. - Seizures: infrequent occurrence, especially in children with a history of febrile seizures. - Severe allergic reaction: hives, swelling of the face or throat. - High‑grade fever: persistent fever above 39°C. - Thrombocytopenia: rare drop in platelet count.

Before administering Influvac Tetra, consider the following precautions. - Allergy assessment: avoid use in individuals with known severe allergy to any vaccine component. - Egg allergy: evaluate risk in patients with severe egg allergy; consult guidelines. - Immunocompromised patients: vaccine may be less effective; monitor immune response. - Acute illness: defer vaccination until the patient recovers from moderate or severe acute illness. - Pregnancy and lactation: use only if benefits outweigh potential risks; discuss with healthcare provider. - Storage: Store at 2‑8 °C: keep refrigerated, protect from light, do not freeze or shake.

Influvac Tetra may interact with other therapies that affect immune function.

Major Interactions (Avoid): - Immunosuppressive therapy: may markedly reduce vaccine efficacy. - Live viral vaccines administered concurrently: may interfere with immune response; schedule appropriately.

Moderate Interactions (Monitor Closely): - Antipyretics (acetaminophen, ibuprofen) taken prophylactically: may blunt antibody response. - Blood products or immunoglobulins given within 3 months: could diminish vaccine‑induced immunity. - Antiviral medications (e.g., oseltamivir) started shortly before or after vaccination: may affect immune response. - Corticosteroids at high doses: may reduce immunogenicity. - Other inactivated vaccines given simultaneously: generally safe but monitor for additive local reactions.