I am sure most people don't even know that nurses also take oath. Take a closer look at it and make out your own conclusions.

I solemnly pledge myself before God and in the presence of this assembly, to pass my life in purity and to practice my profession faithfully. I will abstain from whatever is deleterious and mischievous, and will not take or knowingly administer any harmful drug. I will do all in my power to maintain and elevate the standard of my profession, and will hold in confidence all personal matters committed to my keeping and all family affairs coming to my knowledge in the practice of my calling. With loyalty will I endeavor to aid the physician in his work, and devote myself to the welfare of those committed to my care.
Source: American Nurses Association

The 2 most important points in the pledge are:
1. I will not take or knowingly ADMINISTER any harmful drug ( they were careful enough not to use the work "PRESCRIBE"
2. With loyalty will I endeavor to aid the physician in his work.