What type of agreement is made between a pharmacy and a wholesaler in which the pharmacy agrees to purchase the majority of its product from that wholesaler?

A prime vendor agreement is between a pharmacy and a wholesaler in which the pharmacy agrees to purchase 90% to 95% of its medications from the wholesaler. The wholesaler in turn pro- vides the pharmacy with various resources to improve productivity. A purchase order is an order placed by a pharmacy to a wholesaler in which the pharmacy agrees to pay for the products being ordered.