Is it permissible to remove hair from the eyebrow to restore its natural shape if it has become excessively dense and long due to the intake of certain medications, knowing that this change was not voluntary?

Taking hair with the intention of restoring the condition to its natural form and returning creation to its usual appearance is not among the blameworthy alterations of Allah's creation. Rather, that is blameworthy if it is done seeking beauty and an increase in attractiveness.