Alright, I think I pretty much know what the answer to this is gonna be, but I want to make absolutely sure. I'm a musician, and as such like to take a small dose (~20mg propranolol) of a beta-blocker an hour before performance. We go on at around 9, so somewhere around 8pm I'd like to take the 20mg. Now, I know for a fact that after hours, I'm going to be offered some good cocaine. I don't mind a bit after a performance, and my preferred ROA is IV, I will probably do 2 - 80/90mg shots if I do any at all. My question is - is it going to be dangerous to take the cocaine 4 - 6 hours after 20mg inderal. I know it should not be administered AFTER for cocaine tachycardia, I know they can be dangerous combined. I know the half life of propranolol is 10 hours. So, I'd estimate I'll still have roughly ~10mg left floating around my system by that time.... Any input would be appreciated.