Plain pentazocine was once available in a tablet form....

Name: Problem 22, Chapter 19: Pharmacology : An Introduction
Uploaded: 2020-05-15T13:53:53-08:00
Duration: 35 s
Channel: Sam Limsuwannarot
Description: Plain pentazocine was once available in a tablet form. Naloxone was later added to the tablet. Does this interfere with the pharmacological action of pentazocine when taken orally? Why was this added? (LO 19.8)

Plain pentazocine was once available in a tablet form. Naloxone was later added to the tablet. Does this interfere with the pharmacological action of pentazocine when taken orally? Why was this added? (LO 19.8)

Key Concepts

Pentazocine

Pentazocine is an opioid analgesic with mixed agonist-antagonist properties that acts primarily on opioid receptors to produce pain relief. It is commonly used to treat moderate to severe pain, and its pharmacological effects are achieved when it binds to these receptors in the nervous system.

Naloxone

Naloxone is an opioid receptor antagonist that is typically used to reverse the life-threatening effects of opioid overdose. Its role in combination formulations is to block the effects of opioids when administered by unintended routes, but taken orally it undergoes significant first-pass metabolism, resulting in minimal systemic activity.

First-Pass Metabolism

First-pass metabolism refers to the process by which a drug's concentration is reduced before it reaches systemic circulation, primarily due to liver action after oral ingestion. This metabolism significantly lowers the bioavailability of naloxone when taken orally, thereby preventing it from interfering with pentazocine’s analgesic effects.

Abuse Deterrence

Abuse deterrence is a strategy used in medication formulations to inhibit drug misuse. By including naloxone in an oral pentazocine tablet, the formulation is designed to discourage abuse via non-oral routes (such as injection), because naloxone would become active in such cases, blocking the opioid effects and reducing the potential for misuse.

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