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Related Concept Videos

Opioid Analgesics: Synthetic and Semisynthetic Opioids01:15

Opioid Analgesics: Synthetic and Semisynthetic Opioids

Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
Opioid Analgesics: Morphine and Other Natural Cogeners01:20

Opioid Analgesics: Morphine and Other Natural Cogeners

Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
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Updated: Jun 3, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Published on: July 29, 2014

Efficacy of small doses of ketamine with morphine to decrease procedural pain responses during open wound care.

Carmen Mabel Arroyo-Novoa1, Milagros I Figueroa-Ramos, Christine Miaskowski

  • 1School of Nursing, University of Puerto Rico, Medical Sciences Campus, San Juan, Puerto Rico. carmen.arroyo1@upr.edu

The Clinical Journal of Pain
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PubMed
Summary

Adding ketamine to morphine significantly reduced pain during wound care procedures. However, this combination also increased adverse effects and diastolic blood pressure compared to morphine alone.

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Intracranial Pharmacotherapy and Pain Assays in Rodents
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Published on: April 9, 2019

Area of Science:

  • Anesthesiology
  • Pain Management
  • Pharmacology

Background:

  • Wound care procedures (WCP) can cause significant pain.
  • Morphine is a common analgesic, but its efficacy can be limited.
  • Ketamine is an N-methyl-D-aspartate receptor antagonist with analgesic properties.

Purpose of the Study:

  • To compare the efficacy and safety of morphine with saline (MS) versus morphine with ketamine (MK) for pain management during WCP.
  • To evaluate differences in pain intensity, pain quality, physiological measures, and adverse effects.

Main Methods:

  • Randomized, cross-over design study.
  • Patients received either MS or MK intravenously before WCP.
  • Treatments were crossed-over for subsequent WCPs.

Main Results:

  • Ketamine with morphine (MK) significantly reduced pain intensity during WCP compared to morphine with saline (MS) (mean pain intensity 3.09 vs. 6.82).
  • 91% of patients experienced adverse effects with MK (hallucinations, strange sensations), versus 0% with MS.
  • Diastolic blood pressure was significantly higher during WCP with MK.

Conclusions:

  • Ketamine combined with morphine effectively reduces procedural pain during WCP.
  • The combination of ketamine and morphine is associated with increased adverse effects and elevated diastolic blood pressure.
  • Further research is needed to optimize ketamine dosage or explore co-administration with benzodiazepines to mitigate psychotomimetic effects.