Do not take Tracleer… • if you are allergic (hypersensitive) to bosentan or any of the other ingredients of the tablet • if you have liver problems (ask your doctor) • if you are pregnant, or could get pregnant because you are not using reliable contraceptive methods (hormonal contraceptives alone are not effective when you take Tracleer) • if you are taking cyclosporine A (a medicine used after a transplant or to treat psoriasis)