On the basis of its chemical properties, a good adsorption of sirolimus onto activated charcoal is to be expected. Sirolimus has a molecular weight of 914.17 Dalton, which means that it is expected to be readily adsorbed into the 10–1000 Å-sized charcoal pores of current activated charcoal products [15]. Treatment with activated charcoal in cases presenting to health care services within two hours of overdose therefore seems reasonable.