A flow indicator (F) for an inhaler (I) comprises a housing (1) defining a
mouthpiece (M2), an inlet (2) for connection to the product-dispensing
chamber of the inhaler, a chamber (3) positioned between the inlet and the
mouthpiece of the indicator, and an indicator member (4) movably mounted
in the chamber in such a manner that inhalation at the mouthpiece of the
indicator causes the indicator member to move within the chamber. The
indicator member (4) is so mounted as to co-operate with a switch member
(6, 9) associated with the housing (1) to provide an indication when
inhalation is at an optimum rate for a given inhaler attached to the inlet
(2).
