
Resumen La alimemazina (Variargil®) es un antihistaminico anti-H1 reversible inespecifico que atraviesa la barrera hematoencefalica. Actua como anticolinergico. Su forma de presentacion es en gotas en suspension oral. Su uso clinico esta extendido a rinitis alergica estacional, angioedema y urticaria leve a partir de los 2 anos de edad, conjuntivitis alergica e insomnio de conciliacion en la infancia. Presenta una farmacocinetica muy variable, somnolencia excesiva conocida como «heavy hangover» y efecto de rebote tras su retirada. No esta autorizado su uso en menores de 2 anos. Presentamos el caso de un paciente de 19 meses que acude a Urgencias por referir somnolencia y falta de respuesta a estimulos tras la administracion de alimemazina por dificultad para conciliar el sueno.
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