My wife has been a nurse for over 25 years. I believe she has blessed many people and had many opportunities to be a witness of Jesus. As a general rule, we see nursing as a noble profession.
We are not opposed to all medications, we are mostly concerned about the over-use of medications by believers. It often appears that God's own people have more faith in their doctors than they do the Great Physician. We are also concerned about the use of psychotropic drugs by God's people. We consider these drugs to be the sorts of things that God condemns in Revelation 21:8 and other places ('sorceries' in most Bibles; 'pharmakaea' in Greek).
Another point to consider is the plight of those who do not know the Lord. Some have suggested that the medical profession is an expression of God's mercy toward those who are not connected to the Healer. Of course, the work of believers is to bring unbelievers into contact with the Healer, which could at times create a conflict of interests for believers working in the mediacl profession. There are some books out now on the spiritual dynamics of the medical practice, and some encourage doctors and nurses to pray with their patients. We see this as a step in the right direction.
The bottom line is, we don't see a problem with a believer working as a nurse and dispening medications. But we do think there are some serious issues anyone doing so needs to think about and decide where he or she would draw the line. Of course, there are many areas of nursing and all do not require the same things. Much to think about. We wish you well.