Unit 2- Analgesics Flashcards
CNS Pharmacology
How drugs alter brain activity and offset pathology
Neuro Pharmacology
How drugs act on neurons at cellular/molecular level
Psycho Pharmacology
How drugs modify behavior, perception, and affect thoughts
Drugs Passing BBB
Small, lipid soluble, poorly protein bound, non ionized at CSF pH, diffusion or carrier transport
Analgesic Therapy
Reduce transduction, transmission, modulation, and perception of pain
Visceral Pain
In the abdominal or thoracic cavity
Somatic Pain
Musculoskeletal damage
Neuropathic Pain
Damage affecting somatosensory nervous system
Pain Processing Steps
Transduction into electrical signal, transmission to spinal cord, modulation in spinal cord, processing and perception in the brain
Opioids
Fully synthetic derivatives of opium, actives are Morphine and Codeine
Opiates
Narcotics derived from opium poppy
Opioid Analgesic Use
Prevent and treat post-op pain, produce neuroleptanalgesia with tranquilizers
Dog Opioid Pharmacologic Effects
sedation and narcosis
Cat, Horse, Ruminant Opioid Pharmacologic Effects
Bizarre behavior, CNS stimulation, dysphoria
Opioid MOA
Bind to receptors and inhibit neurotransmission and endocrine secretion, stimulate opioid receptors
Agonist Opioids
Morphine, hydromorphone, oxymorphone, fentanyl, tramadol
Partial Agonist Opioids
Buprenorphine, Butorphanol
Agonist-Antagonist Opioids
Butorphanol, Nalbuphine, Buprenorphine
Antagonist Opioids
Naloxone, Naltrexone
Opioid Receptors
GPCRs that mediate inhibition of neurotransmission and endocrine secretion, present in many tissues
μ-Receptors
Brain and spinal cord receptors that cause respiratory depression, alagesia, euphoria, mild sedation, inhibition of Ach and dopamine release, and GI decrease
κ-Receptors
Cerebral cortex, brain, and spinal cord receptors that cause analgesia, sedation, dysphoria, and diuresis
∆-Receptors
Cerebral cortex and spinal cord receptors that cause analgesia and cardiovascular depression and inhibit dopamine release
CNS Opioid Adverse Effects
Anxiety, disorientation, excitement, dysphoria
Cardiovascular Opioid Adverse Effects
Bradycardia
Respiratory Opioid Adverse Effects
Decreased respiration and tidal volume by μ receptors, decreased O2 and CO2 partial pressure, and ceiling effect
Ceiling Effect
The dose at which there will be no more additional analgesia but adverse effects continue
GI Opioid Adverse Effects
Salivation, vomiting, diarrhea, constipation, colic
Other Opioid Adverse Effects
miosis in dogs, mydriasis in cats, horses, and ruminants, hypothermia in dogs, malignant hyperthermia in cats, noise sensitivity, sweating in horses, urine retension
Naloxone Hydrochloride
Opioid antagonist given IM or IV in dogs, horses, cats, and exotic mammals
Naltrexone
Opioid antagonist given IV or IM in wild animals or orally in dogs for behavior
Morphine Receptors
μ and κ agonist
Methadone Receptors
μ agonist
Tramadol Receptors
μ agonist
Fentanyl Receptors
μ agonist
Carfentanil Receptors
μ agonist
Butorphanol Receptors
Partial μ and full κ agonist
Buprenorphine Receptors
Partial μ agonist
Nalbuphine Receptors
κ agonist, μ antagonist
Naloxone Receptors
Antagonist to all
Naltrexone
Antagonist to all
NMDA
Glutamate receptor and Ca++ ion channel mediating learning and memory
NMDAR Antagonists
Amantadine, Ketamine, Gabapentin, Amitriptyline, and Lidocaine
NSAIDs
Inhibit pro-inflammatory enzyme COX to reduce swelling, stiffness, and joint pain caused by inflammation
Dog Safe NSAIDs
Carprofen, Deracoxib, Firocoxib, Meloxicam
Unsafe NSAIDs
Acetaminophen, Ibuprofen, Aspirin