Betacetylmethadol is a synthetic narcotic analgesic under international control according to the UN Single Convention 1961.

Furethidine, a pethidine analog was studied as an analgesic agent. This compound is not currently used in medicine and is listed in schedules of the single convention on narcotic drugs of 1961 as amended by the 1972 protocol.

Levophenacylmorphan is the synthetic narcotic analgesic and sedative agent. Levophenacylmorphan have been used as pre-anaesthetic medication. Phenazocine and levophenacylmorphan have similar pharmacologic properties and similar analgesic potency. Levophenacylmorphan is under international control according to the UN Single Convention 1961 and its amendments. It is not found in any pharmaceutical preparations sold in the United States.

Diethylthiambutene is an analgesic agent with an effect like that of morphine. Diethylthiambutene mainly used in veterinary. It is highly toxic to cats. Can cause convulsions if injected intravenously. Diethylthiambutene is a synthetic opioid drug. It is under international control according to the UN Single Convention 1961 and its amendments, schedule I.

Ethylmethylthiambutene is a potent analgesic compatible with morphine. It possesses addiction liability similar to that of morphine.

Etoxeridine (Carbetidine or Wy2039), a piperidine derivative, is a narcotic analgetic.

Racemoramide (also known as Moramide) is an opioid analgesic with a central structural action. In clinical trials, Racemoramide shows a strong analgesic action and low toxicity.

Parafluorofentanyl is a selective mu-opioid agonist, an analog of fentanyl, developed by Janssen. The drug was not developed for human use but is produced and abused illegally.

Norlevorphanol is the levo-isomer of 3-hydroxymorphinan (morphinan-3-ol). It is is an opioid analgesic of the morphinan family. Norlevorphanol is a Schedule I controlled substance (opiate).