Hi,
My great grandfather was a bad asthmatic, and in 1950 was given some medication by a doctor in Adelaide called "The Powders". The container also has a number on it - 152013 (not sure if that is relevant). It was administered by a chemist in Adelaide called Birks-Chemist.
He only had one dose and forever after only suffered occasional mild wheezing, he lived healthily til his death at 93.
What would the powder have been?