There are different versions of the oath. Many doctors have refused to take any version prohibiting abortions, and I expect some versions also are structured to allow for patient-requested assistance with bringing about death. At a medical school graduation I attended a few years ago, there were two different versions of the oath used, and the graduating class about evenly split in which one they chose -- there were two group recitations, one right after the other. At any rate, the oath is really just a tradition, like reciting the Pledge of Allegiance, and has no legal significance. I've recited the Pledge without complaint whenever it was expected of me, but I most certainly don't buy into its socialist origins and its anti-states' rights "one nation . . . indivisible" cr*p.
Not to mention that "under God" foolishness.