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Tripoli University
      Faculty of Pharmacy


     Drug Treatment of Pain
              2011-2012

                 BY
PROF. ABDALLA SALEM ELHWUEGI (Ph.D.)
Main Goals

• To know mechanisms and pain pathways.
• To know Classification of analgesics.
• To know about narcotic analgesics (M.O.A.,
  PA, S.E., C.I., T.U., Tolerance and
  Dependence to opioids).
• To know about non-narcotic analgesics
  (M.O.A., PA, S.E., C.I., T.U.)
Peripheral and central Pain pathways


                   • When a pain-producing
                   stimulus       activates     the
                   primary afferent nociceptor,
                   it generates electrochemical
                   impulses      that    propagate
                   through the peripheral nerves
                   to activate spinal cord nerve
                   cells. These nerve cells in turn
                   give rise to the pathways that
                   conduct the pain message to
                   higher     centers     in    the
                   thalamus and cerebral cortex
                   that are required for the
                   conscious perception of pain.
Role of the Brain in Nociception

The brain is vital for 3 aspects of pain:
1. Perception of pain and its characteristics
   (sensory-discrimination).
2. Reaction to pain (emotional aspects of
   pain-affective-motivational).
3. Modulation of pain (especially by
   descending control).
Types of Pain
         Acute Pain                 Chronic Pain
1. An unpleasant sensory 1. Pain in the absence of or
   or emotional experience     following the removal of a
2. Caused by tissue injury.    noxious stimulus. This is
                               also known as
   It is also known as         "pathological pain".
   "physiological" or       2. The presence of chronic
   "nociceptive" pain.         pain implies a lesion or
3. Has a a role in             malfunction in the "pain
   protecting the organism     pathway".
   from injurious stimuli   3. Chronic pain has no
   (noxious).                  protective role and is a
                               disease process.
Mechanisms of Pain Relief

1. Membrane lipid/protein disruption - general
   anesthetics.
2. Ion channel blockade - local anesthetics.
3. GABA receptor modulation - general
   anesthetics, IV anesthetics.
4. “Opioid” receptor activation - Narcotic
   analgesics
5. Enzyme inhibition – Aspirin Like drugs
   (NSAIDs).
Treatment of Pain
       Drugs Known as analgesics

           Types of Analgesics

• Opioid Analgesics   • Non-opioid Analgesics
  • Morphine like          • Aspirin like
                        • Non-steroidal anti-
                            inflammatory
                              (NSAIDS)
I) Narcotic Analgesics &
           Narcotic Antagonists


• Narcotic analgesics are those agents that are
  distinguished from agents such as aspirin in that
  they are used clinically for severe visceral pain
  and possess an dependence (addiction) liability.
Classification Of Opioids

1. Classification based on Source
• Naturally occurring from the exudate of the seed
   pod of the opium poppy. Contains over 20
   alkaloids including morphine and codeine
   (opiates).
• Commercial synthesis of compounds with
   varying therapeutic properties.
• Endogenous Opiate Peptides - Endorphines
   (Enkephalins, Beta-endorphin and Dynorphins).
2. Classification based on action at opioid
     receptors
  Compound             Mu       Delta     Kappa
                       (μ)      (δ)       (κ)
  Morphine             Ag       Ag        Ag
  Fentanyl             Ag       Ag        Ag
  Methadone            Ag
  Pentazocine HCl      pAg                Ag
  Butorphanol          pAg                Ag
  tartrate
  Nalbuphine HCl       pAg                Ag
  Buprenorphine HCl    pAg
  Naloxone HCl         Ant      Ant       Ant

Ag (Agonist) Ant (Antagonist)    pAg (Partial agonist)
Examples

• Opioid drugs that are full agonists at mu
  receptors: “morphine met me finally”:
(Morphine, methadone, meperidine, fentanyl)

• Opioid drugs that are partial agonists at mu
  receptors: “partially b-blocks narcotics”:
(pentazocine, butorphanol, buprenorphine,
  nalbuphine).
The “Opioid” Receptors

A. Characteristics
• High concentrations of these receptors are located in areas
    of the CNS known to involve pain signal transmission
i. The dorsal horn of the spinal cord
ii. Periaqueductal gray
iii.Rostral ventral medulla, and several thalamic nuclei
• Selective binding sites for the opioids.
• Binding of Opioids to these receptors mediate diverse
    pharmacological effects.
B. Properties
•   Structural specificity - small modifications of the drug molecule cause
    large changes in drug binding (and in drug effect in vivo).
•   Stereospecificity - only the l (-) isomeric form of the agent binds with
    high affinity (and is active as an analgesic).
•   Competition between agonists and antagonists - drugs of partially similar
    structure can bind to the receptor and block binding of agonists such as
    morphine.
•   Reversibility - bound drug can be displaced from the receptors by an
    excess of other molecules that possess binding affinity.
•   Binding affinity vs. potency - a good correlation exists between the
    affinity for binding to the receptors and potency of agonist or antagonist
    in vivo.
•   All three major receptors are members of the G-protein-coupled family
    of receptors.
Major Actions of Opioid Receptors
Receptor    Agonist Ligands      Action
Mu (μ)      Endorphins           supraspinal analgesia (μ1)
            Morphine Synthetic
            opioids
                                 euphoria (μ1)
                                 miosis (μ1)
                                 spinal analgesia (μ2)
                                 respiratory depression (μ2)
                                 physical dependence (μ2)
                                 constipation(μ2)
Kappa (κ)   Dynorphins,          spinal analgesia
            Morphine Synthetic
            opioids
                                 Supraspinal analgesia
                                 Miosis
                                 Sedation
Delta (δ)   Enkephalins,,        spinal analgesia
            Morphine Synthetic
            opioids
                                 Modulates mu receptor activity

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Opioid analgesics 1 hwuegi-

  • 1. Tripoli University Faculty of Pharmacy Drug Treatment of Pain 2011-2012 BY PROF. ABDALLA SALEM ELHWUEGI (Ph.D.)
  • 2. Main Goals • To know mechanisms and pain pathways. • To know Classification of analgesics. • To know about narcotic analgesics (M.O.A., PA, S.E., C.I., T.U., Tolerance and Dependence to opioids). • To know about non-narcotic analgesics (M.O.A., PA, S.E., C.I., T.U.)
  • 3. Peripheral and central Pain pathways • When a pain-producing stimulus activates the primary afferent nociceptor, it generates electrochemical impulses that propagate through the peripheral nerves to activate spinal cord nerve cells. These nerve cells in turn give rise to the pathways that conduct the pain message to higher centers in the thalamus and cerebral cortex that are required for the conscious perception of pain.
  • 4. Role of the Brain in Nociception The brain is vital for 3 aspects of pain: 1. Perception of pain and its characteristics (sensory-discrimination). 2. Reaction to pain (emotional aspects of pain-affective-motivational). 3. Modulation of pain (especially by descending control).
  • 5. Types of Pain Acute Pain Chronic Pain 1. An unpleasant sensory 1. Pain in the absence of or or emotional experience following the removal of a 2. Caused by tissue injury. noxious stimulus. This is also known as It is also known as "pathological pain". "physiological" or 2. The presence of chronic "nociceptive" pain. pain implies a lesion or 3. Has a a role in malfunction in the "pain protecting the organism pathway". from injurious stimuli 3. Chronic pain has no (noxious). protective role and is a disease process.
  • 6. Mechanisms of Pain Relief 1. Membrane lipid/protein disruption - general anesthetics. 2. Ion channel blockade - local anesthetics. 3. GABA receptor modulation - general anesthetics, IV anesthetics. 4. “Opioid” receptor activation - Narcotic analgesics 5. Enzyme inhibition – Aspirin Like drugs (NSAIDs).
  • 7. Treatment of Pain Drugs Known as analgesics Types of Analgesics • Opioid Analgesics • Non-opioid Analgesics • Morphine like • Aspirin like • Non-steroidal anti- inflammatory (NSAIDS)
  • 8. I) Narcotic Analgesics & Narcotic Antagonists • Narcotic analgesics are those agents that are distinguished from agents such as aspirin in that they are used clinically for severe visceral pain and possess an dependence (addiction) liability.
  • 9. Classification Of Opioids 1. Classification based on Source • Naturally occurring from the exudate of the seed pod of the opium poppy. Contains over 20 alkaloids including morphine and codeine (opiates). • Commercial synthesis of compounds with varying therapeutic properties. • Endogenous Opiate Peptides - Endorphines (Enkephalins, Beta-endorphin and Dynorphins).
  • 10. 2. Classification based on action at opioid receptors Compound Mu Delta Kappa (μ) (δ) (κ) Morphine Ag Ag Ag Fentanyl Ag Ag Ag Methadone Ag Pentazocine HCl pAg Ag Butorphanol pAg Ag tartrate Nalbuphine HCl pAg Ag Buprenorphine HCl pAg Naloxone HCl Ant Ant Ant Ag (Agonist) Ant (Antagonist) pAg (Partial agonist)
  • 11. Examples • Opioid drugs that are full agonists at mu receptors: “morphine met me finally”: (Morphine, methadone, meperidine, fentanyl) • Opioid drugs that are partial agonists at mu receptors: “partially b-blocks narcotics”: (pentazocine, butorphanol, buprenorphine, nalbuphine).
  • 12. The “Opioid” Receptors A. Characteristics • High concentrations of these receptors are located in areas of the CNS known to involve pain signal transmission i. The dorsal horn of the spinal cord ii. Periaqueductal gray iii.Rostral ventral medulla, and several thalamic nuclei • Selective binding sites for the opioids. • Binding of Opioids to these receptors mediate diverse pharmacological effects.
  • 13. B. Properties • Structural specificity - small modifications of the drug molecule cause large changes in drug binding (and in drug effect in vivo). • Stereospecificity - only the l (-) isomeric form of the agent binds with high affinity (and is active as an analgesic). • Competition between agonists and antagonists - drugs of partially similar structure can bind to the receptor and block binding of agonists such as morphine. • Reversibility - bound drug can be displaced from the receptors by an excess of other molecules that possess binding affinity. • Binding affinity vs. potency - a good correlation exists between the affinity for binding to the receptors and potency of agonist or antagonist in vivo. • All three major receptors are members of the G-protein-coupled family of receptors.
  • 14. Major Actions of Opioid Receptors Receptor Agonist Ligands Action Mu (μ) Endorphins supraspinal analgesia (μ1) Morphine Synthetic opioids euphoria (μ1) miosis (μ1) spinal analgesia (μ2) respiratory depression (μ2) physical dependence (μ2) constipation(μ2) Kappa (κ) Dynorphins, spinal analgesia Morphine Synthetic opioids Supraspinal analgesia Miosis Sedation Delta (δ) Enkephalins,, spinal analgesia Morphine Synthetic opioids Modulates mu receptor activity