Sorry for the late response. Your reply was shunted to spam and I just found it. Curious, as I receive the general asthma.net mailings.
No, amodrine (the spelling is phonetic), was not a heart arrhythmia drug. It was some kind of bronchodilator. My mother was an RN, trained at Rhode Island General, and a head floor nurse at a Ft. Worth hospital when I was a kid. We lived far out in the country, so she treated me herself. Once every two weeks for a number of years we went in to Ft. Worth to see a respiratory MD named Sim Hulsey. I had a reaction to mold, house dust, ragweed, Bermuda grass, et al. I'm certain Dr. Hulsey wrote the prescription. I took this medication for years; carried one in my pocket in case I had an attack at school. I did not suffer from heart arrhythmia, though I do have atria fib now. All I remember is that amodrine was an oval-shaped pink pill with a bitter taste, if you were unfortunate enough to keep it on your tongue too long before swallowing it. It took a long time to work, if an asthma attack was underway. If you took it at the very beginning of symptoms, it worked sooner, of course. It's effects lasted several hours, so if you got ahead of an attack, it worked pretty well. I believe it was a rather light stimulant, as well.