Fluarix Dosing for Adults and Pregnant Women
Adults and pregnant women require only a single 0.5 mL dose of Fluarix per influenza season.
Standard Dosing Regimen
All adults ≥18 years of age receive one 0.5 mL intramuscular injection annually, regardless of pregnancy status. 1, 2
Pregnant women receive the identical single-dose regimen as non-pregnant adults—there is no dose adjustment, no additional doses required, and no timing restrictions based on trimester. 1, 3
The vaccine is administered intramuscularly into the deltoid muscle for adults and pregnant women. 1
Key Points for Pregnant Women
Vaccination is safe and recommended throughout pregnancy at any trimester (second or third trimester vaccination has been specifically studied). 3
Antibody responses in pregnant women are comparable to non-pregnant women, with no diminished immunogenicity during pregnancy. 3
Efficient transplacental antibody transfer occurs, with cord blood antibody titers reaching 1.1 to 1.7 times maternal levels at delivery, providing passive protection to newborns. 3
Tolerability is equivalent between pregnant and non-pregnant women, with similar rates of injection site reactions (92% vs 86%) and systemic reactions (95% vs 87%), most being mild. 3
Critical Distinctions from Pediatric Dosing
Do not confuse adult dosing with pediatric requirements: Children 6 months through 8 years may require two doses spaced ≥4 weeks apart if previously unvaccinated, but this two-dose schedule never applies to adults or pregnant women. 1
Never split or reduce the 0.5 mL dose—the full volume must be administered to all recipients ≥6 months of age. 1
Common Pitfalls to Avoid
Do not administer multiple doses to pregnant women based on misunderstanding of pediatric protocols—one dose per season is sufficient regardless of gestational age or trimester. 1, 3
Do not delay vaccination waiting for a specific trimester—protection is needed throughout pregnancy and vaccination at any point (14-33 weeks gestation has been studied) is appropriate. 3
Ensure true intramuscular injection with appropriate needle length for the deltoid muscle to optimize immune response. 1