Use of phenobarbital tablets together with primidone is not advised as primidone is predominantly metabolised to phenobarbital. Many Animals are vulnerable to painful ear infections plus the buildup of wax and particles. A bit avoidance goes a good distance; merchandise like Epi-Otic and Zymox, useful pet ear cleaners, will help. https://pentobarbital-sodium-onli18418.theideasblog.com/35327001/the-ultimate-guide-to-where-can-i-buy-pentobarbital-natrium