ktliz 379 Posts Specializes in critical care. Aug 24, 2011 On a related note, if you use a regular needle to draw from a vial, does anybody switch to a fresh, sharp needle before giving an injection? I understand the rationale that piercing the stopper dulls the needle, and a dull needle makes for a more painful injection. My instructor last semester did not change the needle. Not sure whether this is a practice I should implement this semester, or if I will be laughed off the floor?