However, folinic acid has an effect on the pharmacodynamics of Xeloda and its toxicity may be enhanced by folinic acid: the maximum tolerated dose (MTD) of Xeloda alone using the intermittent regimen is 3000 mg/ m2 per day whereas it is only 2000 mg/ m2 per day when Xeloda was combined with folinic acid (30 mg orally bid).