Abstract: The present invention relates to a pharmaceutical composition comprising tacrolimus or an analogue thereof and a substance being a substrate for CYP3A4 and/or P-glycoprotein, oral solid dosage forms comprising the pharmaceutical composition such as tablets, methods for preparing the pharmaceutical composition and oral dosage forms and use of the pharmaceutical composition for preparing a medicament. The substance being a substrate for CYP3A4 and/or P-glycoprotein is preferably cyclosporine A. The invention further relates to treatment of a patient in need thereof by coadministration of the combination according to the invention. In a further aspect, the invention relates to the above combination further comprising a CYP3A4 inhibitor compound, preferably a compound naturally occurring in citrus juice, for example grapefruit juice, preferably a spiro ortho ester compound.