Several parts of the Hippocratic oath have been removed or re-shaped over the years in various countries, schools, and societies as the social, religious, and political importance of medicine has changed. Most schools administer some form of oath, but the great majority no longer use the ancient version, which forbade general practitioners from surgery, abortion, and euthanasia.
Also missing from the ancient Oath and from many modern versions are the complex ethical issues that face the modern physician. It has been suggested that a similar oath should be undertaken by scientists, a Hippocratic Oath for Scientists.
Changed portions of the oath:
1. To teach medicine to the sons of my teacher. In the past, medical schools would give preferential consideration to the children of physicians. Some still do.
2. To practice and prescribe to the best of my ability for the good of my patients, and to try to avoid harming them. This beneficial intention is the purpose of the physician. However, this item is still invoked in the modern discussions of euthanasia.
3. Never to do deliberate harm to anyone for anyone else's interest. Physician organizations in most countries have strongly denounced physician participation in legal executions. However, in a small number of cases, a doctor can perform euthanasia, by both his and the patient's consent.
4. To avoid violating the morals of my community. Many licensing agencies will revoke a physician's license for offending the morals of the community ("moral turpitude").
5. To avoid attempting to do things that other specialists can do better. The "stones" referred to are kidney stones or bladder stones, removal of which was judged too menial for physicians, and therefore was left for barbers (the forerunners of modern surgeons). Surgery was not recognized as a specialty at that time. This sentence is now interpreted as acknowledging that it is impossible for any single physician to maintain expertise in all areas. It also highlights the different historical origins of the surgeon and the physician.
6. To keep the good of the patient as the highest priority. There may be other conflicting 'good purposes,' such as community welfare, conserving economic resources, supporting the criminal justice system, or simply making money for the physician or his employer that provide recurring challenges to physicians.
Source: Wikipedia