Structural formula of<unk> <unk><unk>  (or slow-release) formulations of<unk>  are those whose effect last substantially longer than bare<unk> , availing for e.g. one administration per day. Conversion between<unk><unk>  and immediate-release (or "regular")<unk>  is easier than conversion to or from an equianalgesic dose of another opioid with different half-life, with less risk of altered pharmacodynamics.
Extended-release morphine
Patient-controlled analgesia
Noroxycodone
Morphine
Oxycodone
Acetylmethadol
Hydrocodone
Codeine