A compliance monitoring module for an inhaler comprising: a miniature pressure sensor, a sensor port of said sensor being configured to be pneumatically coupled to a flow channel of said inhaler through which a user can inhale; a processor configured to: receive data from a sensing element of the pressure sensor; receive data from a mode sensor configured to detect when the inhaler changes from an inactive mode to an active mode; and based on said data from said pressure sensor sensing element and said data from said mode sensor, compile a compliance report; and a transmitter configured to issue said compliance report.本發明係關於一種用於吸入器之順從性監控模組,其包括:小型壓力感測器,該感測器之感測器埠經構形來以氣動式耦合至該吸入器之流動通道,使用者可通過該流動通道吸氣;處理器,其經構形以:接收來自該壓力感測器之感測元件之資料;接收來自經構形以偵測該吸入器何時自非活動模式變化至活動模式之模式感測器之資料;及基於來自該壓力感測器感測元件之該資料及來自該模式感測器之該資料編譯順從性報告;及一經構形以發佈該順從性報告之傳輸器。