You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following drugs can be safely prescribed in pregnancy - and explain in detail?
For pregnant women and women who have given bih, heparin is the anticoagulant of choice and is recommended by the Royal College of Obstetricians and Gynaecologists. It does not cross the placenta, and therefore is considered to be safe . Ref - Harrisons 20e p848-850