US Patent 11918735 Dual metered inhaler

An inhaler having first and second user-operable controllers configured to independently meter first and second amounts of a physiologically active substance and a pressurized gas, respectively, to a user is disclosed. A regulator is configured to release a dose to the mouthpiece in some embodiments. Triggering can be activated by one or more of (1) the user drawing a breath through the mouthpiece, and (2) the user operating a trigger.