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Paracetamol versus Ibuprofen Before and After Paediatric Vaccination: A Clinical Evidence Review
Gianvincenzo Zuccotti1,2, Virginia Rossi1,2, Valeria Calcaterra2,3
1Department of Biomedical and Clinical Science, University of Milan, Milan, Italy.
Insights
Routine prophylactic use of antipyretics like paracetamol before or after vaccination can reduce fever but may lower vaccine-induced antibody titers. A symptom-based approach is recommended for optimal immune response and vaccine effectiveness.
Area of Science:
- Pediatric immunology
- Vaccinology
- Pharmacology
Background:
- Post-vaccination fever is a common immune response.
- Antipyretics are often used in children, but concerns exist about their impact on vaccine immunogenicity, especially when given preventatively.
Purpose of the Study:
- To review evidence on the prophylactic and therapeutic use of paracetamol and ibuprofen in children following vaccinations.
- To assess the effects on fever, reactogenicity, antibody titers, and clinical safety.
Main Methods:
- A narrative review of pediatric studies was performed.
- Included randomized trials, systematic reviews, and health-economic analyses.
- Focused on outcomes like fever, antibody response, and safety.
Main Results:
- Prophylactic paracetamol reduced fever but attenuated antibody titers, particularly with pneumococcal conjugate vaccines.
- Ibuprofen did not show immunogenic suppression but isn't recommended preventatively.
- Therapeutic use (after symptom onset) had no negative impact on immune responses.
- Ibuprofen was more effective for fever but unsuitable for infants under 6 months.
Conclusions:
- Routine pre-dosing with antipyretics should be avoided.
- A symptom-based approach enhances immune priming and vaccine adherence.
- Consider prophylactic paracetamol only for high-reactogenicity vaccines or seizure risk.
Aim:
Post-vaccination fever is a common adaptive immune response. Antipyretics are frequently used in paediatric practice to manage symptoms; however, concerns have emerged regarding potential interference with vaccine-induced immunogenicity, particularly when administered prophylactically.
Methods:
A narrative review of paediatric studies assessing prophylactic and therapeutic use of paracetamol and ibuprofen after routine vaccinations was conducted. Evidence was derived from randomized trials, systematic reviews, and real-world health-economic analyses, focusing on fever, reactogenicity, antibody titers, and clinical safety.
Results:
Prophylactic paracetamol consistently reduced fever but was associated with attenuated antibody titers during the primary vaccine series, notably with pneumococcal conjugate vaccines. Ibuprofen showed no measurable immunogenic suppression but is not recommended as a routine preventive strategy. Therapeutic antipyretic use, administered only after symptom onset, demonstrated no negative effect on immune responses. Ibuprofen was more effective than paracetamol for fever reduction in symptomatic children but is unsuitable in infants < 6 months. Prophylactic paracetamol is selectively justified only in high-reactogenicity contexts (e.g., 4CMenB) or in children at risk of febrile seizures.
Conclusions:
Routine pre-dosing of antipyretics should be avoided. A symptom-based approach optimizes immune priming, ensures clinical safety, and supports adherence to vaccination schedules.
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