Rapacan is an immunosuppressant medication manufactured by ERIS Lifesciences, available in a 1mg strength. It contains Sirolimus as its active ingredient, a macrolide compound that works by inhibiting the mTOR (mammalian target of rapamycin) pathway to suppress immune responses. Rapacan is primarily used to prevent organ rejection in patients who have undergone kidney transplantation by reducing the activity and proliferation of T-cells. It is typically taken once daily, with or without food, and should be taken at the same time each day for consistent blood levels. The medication should be stored in a cool, dry place, away from heat and direct sunlight. Patients are advised to avoid grapefruit juice during treatment, as it can interfere with the metabolism of Sirolimus. Regular monitoring of blood levels, kidney function, and lipid profiles is recommended during long-term use.