I'm not sure if they still make them, but I've actually had a few 16mg Hydromorphone "double-layer" pills. 8mg being IR & 8mg being CR. I remember having to de-coat them, and then seperate the halves to be able to boot the IR half. Kept the CR half for maintenance. With no generics available I remember someone saying that without insurance they were INSANELY expensive, that I have no doubt. IMO, in the US anyway, I'm glad they're not more. As of now it's more cost effective to just prescribe an IR & CR, gives you the option of different drugs for breakthrough etc, isn't one more narcotic made medicinally useless via abuse deterrent & lastly would give big pharma even more bullshit patents to drive out generics and thus "bye-bye" reasonable prices.