Persona Suppressors

Persona Suppressors are a drug featured in the Persona (Series). Their common function is to keep unruly Personae from killing their hosts.

In Persona 3
In Persona 3, Persona suppressors were used by Strega as well as by Shinjirou Aragaki. Stopping the use of the drug could result in a user's Persona killing them.

In -Trinity Soul-
In Persona -Trinity Soul-, Persona suppressors were used by Marebito as well as Ryou Kanzato. While the over all function of the suppressors were the same, Marebito required them because their Personae had consumed too many other Personae, causing them the to go berserk. Additionally, Personae were explained to have a age limit, so older users lost control of their Persona and required suppressors if they wanted to continue to summon them.