Apparatus and method for recording the amount of medicament ejected from an injection device

An apparatus for recording an amount of medicament ejected from an injection device, the apparatus comprising:

• a primary sensor arranged to detect dose information generated by the injection device, the primary sensor being configured to generate output corresponding to the detected dose information;
• a secondary sensor arranged to detect ejection of medicament from the injection device;
• a processor to receive information from the primary sensor and the secondary sensor;
• and a memory, wherein:
• the processor is configured to process the output generated by the primary sensor, and record, in the memory, information indicative of the amount of medicament ejected from the injection device only when the processor determines, on the basis of information received from the secondary sensor, that more than a predetermined amount of the medicament has been ejected.