An injection device adapted to be worn on the body of a patient. The device includes an injector containing an agent for treating hypoglycaemia. A control assembly including a signal receiver is configured to receive signals from a glucose sensor, the control assembly being electrically coupled to an alarm and configured to activate the alarm upon a signal received in the signal receiver being indicative of hypoglycaemia, the control assembly being configured to cause the injector to administer through a needle a dose of the agent to the patient after a predetermined period of time of the signal receiver receiving the signal indicative of hypoglycaemia, the control assembly having a manually activated switch that when activated prior to the expiration of the predetermined period of time causes the control assembly to abort the injection of the agent.
