LETTERS
Interaction between trazodone and carbamazepineTO THE EDITOR: Trazodone is an antidepressant derived from triazolopyridine. We describe a case in which the therapeutic combination of trazodone and carbamazepine is associated with a distinct increase in the serum concentration and serum concentration/dose ratio of carbamazepine.Case Report. A 53-year-old white man weighing 79 kg was diagnosed with secondarily generalized partial epilepsy and depression. He took carbamazepine and diazepam 10 mg/d and began treatment with trazodone 100 mg/d. The initial carbamazepine dose was 600 mg/d and was increased three months later to 700 mg/d ( Table 1). The biochemical parameters indicated normal hepatic function.The data of the analytical tests made to monitor the carbamazepine concentrations by fluorescent polarization immunoassay (TDx, Abbott Laboratories) are shown in Table 1. Blood samples were extracted in the morning, between nine and 10 hours following the last carbamazepine dose. The time sequence of carbamazepine concentration/dose ratio changes (Table 1) indicated a concentration/ dose ratio ~0.8 before trazodone treatment and an increase in concentration/dose ratio at the last analytical check, two months after beginning trazodone treatment, without an explanation for the increase. The patient did not show signs or symptoms of carbamazepine toxicity when the carbamazepine concentration increased.
El problema más común de la terapéutica con digoxina sigue siendo el riesgo de intoxicación con dicho fármaco. La incidencia de tal intoxicación se ha reducido en los últimos años, tanto en los pacientes hospitalizados como en los ambulatorios (1-5). El motivo principal de esta reducción es la determinación habitual de la digoxinemia; su petición se efectúa con frecuencia sin especificar el motivo (3,6). Por el contrario, hay sospechas de intoxicación digitálica en las que no se encuentran niveles tóxicos de digoxina (7). Por otro lado, es relativamente frecuente el hallazgo casual de una digoxinemia tóxica sin sintomatología (3,4,8-10). En consecuencia, existen sospechas de intoxicación digitálica que no se confirman analíticamente, e intoxicaciones por digoxina que no se sospechan (11-13). Los objetivos del presente trabajo son cuantificar y analizar las intoxicaciones digitálicas y sus sospechas en la población estudiada.
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