Infusion pumps allow for high viscous medications to be administered through small catheters into the veins. Medication is usually administered this way through the dorsal veins of the hand, the forearm, the arm, the dorsal veins of the foot, the inguinal region and the antecubital fossa.Infusion pumps allow for high viscous medications to be administered through small catheters into the veins. Medication is usually administered this way through the dorsal veins of the hand, the forearm, the arm, the dorsal veins of the foot, the inguinal region and the antecubital fossa.