Q. I am a pharmacy student can you tell me what a primary source is?

According to the Pharmaceutical Medicine Dictionary (2001), it is "The information source that is derived directly from fully described (or referenced) formal observation, procedures or experiments performed with valid, scientifically accepted methods. In its strongest form, this material is usually (but not only) a paper in a refereed scientific publication."

It is best to consult your instructor to determine what is an acceptable primary source for your assignment.