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Removing false beta-lactam allergy warnings: role of the clinical pharmacist in collaboration with the allergology service

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European Statement

Clinical Pharmacy Services

Author(s)

Carlos Santos Rodríguez, Silvia Irene Corrales Vargas, Maria de los Ángeles Peña Peloche, Alfredo Julian Jover Sáenz, Miguel Ángel Ramos Gil, Arturo Morales Portillo, Marta Mir Cros, Francisco Ignacio Torres Bondia, Lluis Marqués Amat, Joan Antoni Schoenenberger Arnaiz

Why was it done?

Beta-lactam antibiotics are the most commonly used group of antimicrobial drugs but are also the ones with the most significant induction of allergic reactions. However, it is known that many of these patients do not present reactions upon rechallenge or have false allergy warnings in the medical records.

What was done?

To assess the impact of a pharmacist-driven programme for active beta-lactam allergy warning removal in adults in collaboration with the Allergology service.

How was it done?

We identified adults with active beta-lactam allergy warnings among outpatients aged 35 to 45 years over 26 months.
Both in the hospital and primary care setting the pharmacist assessed the current information of the cases in the electronic medical records (EMR) and through personal interviews or by telephone. The following data were retrieved: year of allergy registration, type of reaction described, tolerance of beta-lactam antibiotics, and the existence of Allergology reports.
The pharmacist, previously trained by the Allergology service, could proceed to remove or confirm the allergy label, if applicable, or refer the patient to the Allergology service for allergy tests.

What has been achieved?

We reviewed a total of 1178 cases with active beta-lactam allergy warnings. The most frequently implicated beta-lactam drug was amoxicillin, with 170/1178 (14.4%) cases.
111/1178 (9.4%) of cases had an allergic reaction in childhood, and in 714/1178 cases (60.6%) EMR did not describe the symptomatology or treatment that justifies the allergy.
The allergy warning was directly removed in 93/1178 (7.9%) of patients, as they had previous reports of Allergology, had tolerated antibiotics after the allergic reaction, or did not present symptoms compatible with an allergic reaction.
The review confirmed allergic warnings in 43/1178 (3.65%) cases, according to the symptomatology and the information recorded in the Allergology reports.
One thousand and forty-two cases were referred for beta-lactam allergy test performance in the allergology service, of which 47% yielded a negative result.

What next?

The pharmacist is qualified to remove the warning in cases with a doubtful allergy to beta-lactam antibiotics after a thorough medical record review and informed consent. Moreover, the pharmacist can provide valuable information that allows the classification of warnings according to the detected risk and facilitates subsequent decision-making by the allergist.

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