a holder with a safety shield for a drug delivery device ; the shield obstructing access to a needle of the drug delivery device following use thereof . the safety shield may be actively deployed , in which case the health care worker must perform an action beyond complete depression of the pusher into the body of the drug delivery device to deploy the shield . alternatively , the safety shield may be deployed passively or automatically , in which case deployment of the shield occurs upon complete depression of the pusher into the body , with no additional action required of the health care worker . the safety shield is springloaded and released to its extended position by a mechanical coupling of a series of position members , including levers , formed on the holder and the drug delivery device .