Dose 1 varilirix na dose 2 variped will there be any reaction?
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Varilrix dose 1 then Varivax or Varipед dose 2 interchangeable varicella vaccine safety
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varicella vaccine interchangeability immunogenicity safety
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Varilrix Variped interchangeable varicella chickenpox vaccine two-dose schedule different brands
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I now have very clear, authoritative information to answer this question. Here's a comprehensive answer:
Varilrix (Dose 1) → Variped (Dose 2): Is This Safe?
Yes — this is acceptable and supported by the official prescribing information.
What Are These Vaccines?
| Vaccine | Manufacturer | Strain |
|---|---|---|
| Varilrix | GlaxoSmithKline (GSK) | Oka/RIT strain (live attenuated VZV) |
| Variped | MSD/Sanofi | Oka/Merck strain (live attenuated VZV) |
Both are live attenuated varicella (chickenpox) vaccines belonging to the same vaccine class (VAR — univalent varicella vaccines). They work by the same mechanism and produce the same type of immunity.
Interchangeability — Official Position
The Varilrix prescribing information explicitly states:
"A single dose of VARILRIX may be administered to subjects who have already received a single dose of another varicella-containing vaccine." "A single dose of VARILRIX may be administered followed by a single dose of another varicella-containing vaccine."
This directly covers the scenario of Varilrix Dose 1 → Variped Dose 2 (and vice versa).
The Canadian Immunization Advisory guidance echoes this:
"If it is not possible to use the same vaccine for the second dose as for the first, administering the second dose with a different formulation from another manufacturer is preferable to discontinuing the schedule."
Will There Be Any Adverse Reaction?
No unique or additional adverse reactions are expected from mixing brands. Both vaccines share the same:
- Live attenuated Oka-strain VZV
- Same route of administration (subcutaneous)
- Same dose volume (0.5 mL)
- Same contraindications and precautions
Expected reactions are the same as any varicella vaccine dose:
- Local: Injection-site pain, redness, swelling (~21–25%)
- Systemic: Fever, mild rash (varicella-like), malaise
- Reactions after Dose 2 are generally milder systemically than after Dose 1, since the immune system responds more efficiently
Key Scheduling Points
- Minimum interval between doses: 4 weeks (preferably ≥6 weeks)
- If given alongside another live injectable vaccine (e.g., MMR) at a different visit, allow ≥4 weeks between them
- Do not mix up varicella vaccine (VAR) with herpes zoster vaccine (e.g., Zostavax, Shingrix) — those are different products and not interchangeable with varicella vaccines
Bottom line: Giving Varilrix as Dose 1 and Variped as Dose 2 is safe, immunologically effective, and explicitly permitted in official prescribing information. There is no increased risk of adverse reactions from switching between these two brands.
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