A compliance monitor for a dry powder medicament delivery device

A compliance monitor for monitoring patient usage of a dry powder medicament delivery device, the medicament delivery device including:

• a) a store of medicament housed within a main body portion,
• b) a base portion, said base portion and said main body portion being rotatable with respect to each other,
• c) a medicament dispensing means for dispensing a dose of the medicament into an inhalation chamber,
• d) a mouthpiece through which the dose of medicament may be inhaled by a. user,
• e) a removable and replaceable cap,
• and the compliance monitor including:
• f) a first portion for receiving and/or retaining the base portion of the medicament delivery device,
• g) a second portion for releasably securing the medicament delivery' device to the first portion, thereby releasably attaching the compliance monitor to the medicament delivery device,
• the arrangement and construction being such that the fitting of the second portion of the compliance monitor to the first portion of the compliance monitor does not include a screw fit.