Abstract: The present invention relates to a drug dispenser using a compressed gas. More particularly, the present invention relates to a drug dispenser which discharges a drug in a drug container by supplying a compressed gas into the drug container. The present invention provides a drug dispenser including: a casing to which a compressed gas container for storing a compressed gas is coupled; a compressed gas gate which is provided in the casing, and opens or closes a supply of the compressed gas from the compressed gas container; a compressed gas delivery unit which delivers the compressed gas supplied from the compressed gas gate; and a dispensing unit to which a drug container is coupled and which is formed at one side of the casing to discharge the compressed gas and at least a part of a drug stored in the drug container to a drug discharge unit by supplying the compressed gas supplied from the compressed gas delivery unit into the drug container.