The physician information about Thelin should contain the following key elements: • That Thelin is teratogenic o Use of effective contraception in women of child bearing age o Possible interaction with oral contraceptives and increased risk of thromboembolism o Need to advise female patients about teratogenicity, contraception, if necessary the need for pregnancy testing and what to do if they become pregnant o Referral of patients who become pregnant to a physician specialised or experienced in teratology and its diagnosis for evaluation and advice