A drug receptacle for use with a respiratory inhaler device. The drug receptacle has a fluid flow rate indicator on an outer surface thereof. The fluid flow rate indicator comprises a corrugated portion having at least one and preferably a plurality of corrugations extending radially from the outer surface of the drug receptacle. The flow rate indicator is operable to generate a sound signal. The present invention also relates to a corrugated flow rate indicator having a connection portion for connection to the outer surface of a drug receptacle.
