A secure liquid drug dispenser for delivering pre-determined doses of medication for oral administration, including an airtight container (1) pressurized thanks to a micro pump (28) defining a pressurized area (10) in which a flexible bag (13) containing the drug to deliver is attached, the flexible bag (13) being connected to a valve (20) located within a second non pressurized area (21) of the container for delivering doses of drug trough a delivery port (23). A microcontroller within the pressurized area (21) controls the opening of the valve for precise delivery of drug doses and monitors the pressure within the pressurized area (21). The drug dispenser is further equipped with a neutralization subsystem (16) for inactivating the medication contained in the flexible bag (13) and biometrics elements are provided to identify the patient. A method of delivering doses of liquid medication is also disclosed.
