A device is disclosed for the treatment of asthmatic patients suitable for performing the double function of peak expiratory flow rate (PEFR) meter and device for delivering drugs used in the treatment of asthma. The PEFR meter (1) and the devices (2) for delivering the drug are disposed in the same container, which comprises a sole rotating mouthpiece (3) which allows the patient to select each time the function (measurement of PEFR or delivery of the drug) he means to use.
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