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Pesquisa & Inovação

Mesma dose de hidroxicloroquina pode ser metabolizada de formas diferentes

Pesquisadores da Universidade Uppsala, na Suécia, desenvolveram um novo método para medir os níveis de hidroxicloroquina em pacientes com lúpus eritematoso sistêmico (LES), doença autoimune para a qual o medicamento é indicado. Segundo o estudo, publicado nesta segunda-feira (1) na revista Arthritis Research and Therapy, a tática de análise poderá ser útil também para pesquisas com foco no tratamento da Covid-19.

A hidroxicloroquina e a cloroquina têm sido testadas para tratar pessoas infectadas pelo novo coronavírus. Entretanto, diversos estudos indicam que esses remédios não ajudam, de fato, a combater a doença — e em alguns casos podem inclusive levar à morte.

Para investigar os riscos da hidroxicloroquina em relação ao LES, os pesquisadores suecos compararam os níveis da droga em partes isoladas (plasma e soro) e em todo o sangue de pacientes com a doença autoimune. De acordo com os cientistas, essa é uma nova forma de analisar a taxa da droga no metabolismo, já que antes o índice era avaliado apenas nas partes isoladas do sangue.

O que os estudiosos perceberam é que a mesma dose de hidroxicloroquina pode ser metabolizada de maneiras diferentes em cada pessoa. “Um resultado impressionante, e uma visão muito importante, é que os níveis [da droga] no sangue de pacientes prescritos com a mesma dose podem diferir em até 15 vezes entre eles”, afirma Kim Kultima, um dos autores do estudo, em nota. “Isso indica uma grande variação individual na maneira como o medicamento é metabolizado.”

Sendo assim, possíveis riscos da droga poderiam ser minimizados ajustando a dosagem a cada paciente — o que não se aplica àqueles com Covid-19. “Temos que ter muito cuidado ao tirar conclusões precipitadas sobre se a hidroxicloroquina é eficaz contra a Covid-19”, observa Kultima. “O que sabemos hoje [com este estudo] é que o método de análise esperançosamente levará a melhores dados para fornecer dosagens corretas aos pacientes com LES que usam o medicamento.”

Ainda são necessários, portanto, mais estudos para entender se a hidroxicloroquina apresenta, de fato, alguma eficácia contra a Covid-19 e qual seria a dosagem ideal nesses casos. Mas esse trabalho certamente oferece novas pistas para essa investigação.

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