Mnemonics Short and long acting bronchodilators

Short acting bronchodilators and long acting bronchodilators

Metro are trains & trains are long. So any drug with "metro" like word is long acting.

List of long acting bronchodilators:
Salmeterol
Formoterol or Eformoterol
Arformoterol

But is a small word. So any drug with the word, "but" is short acting.
List of short acting bronchodilators:
Salbutamol or Albuterol
Terbutaline
Levalbuterol

This is just a general guide I made for myself for inhaled preparations and may not apply to all drugs. Example, Terbutaline oral is long acting.
Also bambuterol has a "but" but it is long acting!