It is a derivative of isonipecotic acid, like pethidine, and is metabolized in part to norpethidine. Its potency range is due to method of ingestion. figure 20-80 times as potent as pethidine as an analgesic. The greatly increased potency essentially eliminates the toxic effects of norpethidine accumulation which are seen when pethidine is administered in high doses or for long periods of time.
Phenoperidine
Pethidine
Aceclidine
Esketamine
Pentoxyverine
Denaverine
Oliceridine
Diphenylpyraline