The safety of carbamylated monomeric allergoids for sublingual immunotherapy. Data from a pharmacovigilance study

Aim: Sublingual immunotherapy (SLIT) is significantly less concerned by systemic reactions than subcutaneous immunotherapy. Allergoids were introduced to reduce systemic reaction to subcutaneous immunotherapy, but may also be used for SLIT. Methods: This pharmacovigilance study evaluated the post-marketing reports collected in a safety database, including the number and the type (serious or not serious) of adverse drug reactions (ADRs) in Italy by SLIT with the carbamylated monomeric allergoid (CMA). Results: More than 15,000,000 CMA tablets were administered, with 25 spontaneous reports of ADRs, only two being serious. Conclusion: The rate of ADRs to CMA we found in this pharmacovigilance survey, corresponding to 0.0004% of all administered doses, is far lower than the rates commonly reported for allergen SLIT products.