Tell me if you develop hives, [ he says with the air of someone who's not going to stick around long enough to see for himself, apparently ignoring that significant look. ] The analgesic effect should last for about six days. It has properties meant to promote regenerative healing but the drug you took may counteract it. If not, it'll still be a slow process.

[ Delicate injuries left to mire for years; Severus doesn't think anything more aggressive will help - and may actually hurt. This has been a careful brewing process. It took him weeks to finish it for a reason. ]

If you decide you want to proceed with this as a treatment, you know where to find me.