I've been there many times. If it happens I usually get a taste in the back of my throat/mouth from the tren, and I know it's coming. If at all possible if you can hold the first cough back and just suppress it, sometimes it will pass. If you do cough that first time, it's on then, and it just has to run it's course. I've coughed till I was about to throw up. I just consider it cardio for that day.