A client, scheduled to receive one unit of packed red blood cells, has a history of an allergic reaction to a transfusion in the past. what class of medication will assist in preventing a reaction to the packed red blood cell transfusion?

If a client who is scheduled to receive one unit of packed red blood cells, has an antiquity of an allergic reaction to a transfusion. The class of medication that will assist in preventing a reaction to the packed red blood cell transfusion is Antihistamines.