A method of retrieving a vial from a carrier includes the steps of: contacting a vial contained within a carrier with a gripper assembly to shift the position of the container to one end of the carrier and to adjust the position of the carrier on a platform from a diverted position to a retrieval position; lifting the vial from the carrier with the gripper assembly; and returning the vial to the carrier with the gripper assembly. Such a method can improve the accuracy and precision of moving the vial to and from the carrier for dispensing.