Furethidine

Furethidine is a synthetic opioid that was first synthesized in the 1960s. It is a potent analgesic that is used in the treatment of severe pain. Furethidine is a member of the benzomorphan class of opioids and is closely related to other drugs in this class such as phenazocine and pentazocine.

Chemistry

Furethidine is a benzomorphan, a class of opioids that are structurally distinct from the more well-known morphine-like opioids. The benzomorphans are characterized by a benzene ring fused to a morphinan skeleton. Furethidine, like other benzomorphans, is synthesized from thebaine, a naturally occurring opiate alkaloid.

Pharmacology

Furethidine acts primarily as an agonist at the mu-opioid receptor, the primary site of action for most opioid drugs. It has a high affinity for this receptor, which is responsible for its potent analgesic effects. Furethidine also has some activity at the kappa-opioid receptor, which may contribute to its analgesic effects and may also be responsible for some of its side effects.

Clinical Use

Furethidine is used in the treatment of severe pain. It is typically administered by injection, and its effects are rapid and potent. However, like other opioids, it has a high potential for addiction and dependence, and its use is therefore typically reserved for situations where other analgesics are ineffective.

Side Effects

The side effects of furethidine are similar to those of other opioids and can include nausea, vomiting, constipation, and respiratory depression. It can also cause psychological dependence and physical dependence, leading to withdrawal symptoms if the drug is discontinued abruptly.

See Also

• Opioid
• Benzomorphan
• Thebaine