Up to now, I have not been concerned but other questions on medications have prompted me to check.
I have mild asthma, I rarely have an attack but I like to carry a Salbutamol inhaler as a precaution. Normally, one in hand carry and one in check-in as a precaution. It is prescribed.
I'm not sure whether it counts as a liquid but, when it is required to separate liquids, I include my inhaler. So far, within Europe, US, and Canada, I have had no comments. Neither that it is a problem nor that it should not be in the liquids bag.
Further afield, e.g. the Far East, do any countries restrict Salbutamol?