@freemo @lupyuen In the US, Vic's contains levomethamphetamine. Benzedrex contains Propylhexedrine which is not methamphetamine because the Cyclohexyl group is where a Phenyl group would be.

Ephedrine and Sudo Ephedrine are OTC after the government collects information. There's a Hydroxyl group in the 4 position that makes it not methamphetamine.

The former two are decongestants that I highly recommend but I doubt they are going to work well for Asthma. The latter two can be found in Ephedra Sinica or Ma Huang. The herb is used in TCM and has been used to treat asthma.

I think the best inhaler would contain Salbutamol or a similar molecule. Phenylephrine is used to treat priapisms by injecting a solution into a vein of the organ. If only congestion relief was as easy and convenient.