At the first occurrence, treatment should be interrupted until resolution, then resumed at the same dose level; At the second occurrence of the same event, treatment should be interrupted until resolution; treatment should then be continued with a reduced dose of 9 mg/ kg bodyweight/ day; At the third occurrence of the same event, treatment should be interrupted until resolution; treatment should then be continued with a dose further reduced to 6 mg/ kg/ day; Treatment should be discontinued, if severe adverse reactions are still encountered at the 6 mg/ kg/ day dose.