
It's the usual meds he takes. I think to stabilize his pheromones - i'm not exactly sure if it is as the translation I read wasn't good in this part. He doesn't release them the normal way which is sex so needs medical intervention. They're also kinda like drugs. The amount he's been taking could have killed a normal person by now but since he's extreme alpha he has time. This issue is a big part of the plot

Spoiler
Actually, he doesn't care about his live and want to die, he try later but Josh stoped him. In one part of the novel Josh tell Chase that he can do anything for Chase, Chase ask even kill someone? (Even kill him). In one of the extras he is in his rut alone and the brother go for Josh, when Chase see Josh, he smile and ask him is he is there to kill him, and ask to please kill him.
It's been such a long time I've encounter a stupid ML, he's so fucking dumb. He just swallowed pills from unlabeled bottle. He's hopeless. I don't feel bad. He's really dumb. Get it together bro... Like... Please actually use 2 left over braincell atleast and stop making it harder for yourself