Test 1 Flashcards
Drugs for mild pain
APAP, Aspirin, NSAIDs, Cox-2 inhibitors
Drugs for moderate pain
NSAIDs, Opioid + APAP, Tramadol
Drugs for severe pain
Opiods
APAP MoA
- Inhibit the synthesis of prostaglandins in the CNS
- work peripherally to block pain impulse generation
Dosing for APAP
325-650 mg q4h or 100 mg Q6h or
1000 mg Q6h
Max dosing for liver patient on APAP
2 gram/day
Max dosing for APAP
4 grams/day
APAP routes
PO, PR. IV is very expensive
APAP adverse effects
hepatotoxicity
Function of cox-1
cytoprotective: protects GI, lungs, and kidneys; plays part in platelet aggregation and vasoconstriction
Function of cox-2
Inflammatory: Inflammation, pain • Antiplatelet •Vasodilation
Aspirin MoA
irreversibly binds to cox-1 and cox-2
Aspirin properties
analgesia
anti-inflammatory
antipyretic
antiplatelet (irreversible)
Aspirin antiplatelet MoA
prevents synthesis of thromboxane A (a vasoconstrictor and iducer of platelet aggregation)
Aspirin onset
15-20 minutes
Aspirin peak
1-3 hours
Aspirin duration
3-6 hours
Aspirin half-life
3 hours
Aspirin elimination
urine and liver
Aspirin adverse effects
GI bleeding, salycylism, reye’s syndrome, asthma patients: bronchospasm, uticaria, angiodema
Salicylism
dizziness, deafness, tinnitus
Important NSAIDs
Ibuprofen, Indomethacin, Ketoralac, Naproxen
NSAIDs properties
analgesic, antinflammatory, antipyretic, antiplatelet (reversible)
NSAID adverse effects
cardio: fluid retention, htn, edema GI: irritation, ulcers, bleeding, perforation Respiratory: bronchospasm Skin: rash Renal: insufficiency or liver failure
NSAID black box warning
serious CV event, GI bleed perforation
Which med is used for periop pain in CABG
NSAIDs
Ketorolac route
IV and IM
Ketorolac usage
short term mgmt of mod to sever pain (max 5 days)
Ketorolac adverse effects
severe post-op bleeding; renal failure
Advantages of cox-2 inhibitor
- decreased pain and inflammation with minimal GI side effects
- no effect on platelet aggregation/improved bleeding profile
Disadvantages of cox-2 inhibitor
- renal dysfunction
- avoid in pts who have sulfa allergy
- CV events (increased vasoconstriction)
Morphine routes
PO, PR, IV, IM, SubQ, epidural, intrathecal
Morphine doses*
PO: 15-30 q4h PRN
IV_ 2-4 mg q4h PRN
Morphine elimination*
renally
Unique morphine properties
2 active metabolites; histamine release (hypotension and pruritis)
Hydromorphone trade name
dilaudid
Hydromorphone routes
PO, PR, IV, IM, SubQ, epidural
Hydromorphone dosing*
PO: 2-4 mg q4-6 h
IV: 0.2-1 mg q2-3h
Hydromorphone metabolism
half life: 2-3 hours
not renally cleared
no active metabolites
Methadone route
PO, IV, IM, SubQ
Methadone metabolism
- biphasic elimination: analgesic 1/2 life: 8-12 h; terminal 1/2 life: 24-36h
- renally cleared
Methadone adverse effects
QT prolongation*; serotenergic effects; lower seizure threshold
Meperidine route
PO, IV, IM, SubQ
Meperidine dosing
IV: 50-150 mg q4-6h
Meperedine metabolism (and active metabolite)
renally; normeperidine
Meperedine adverse effects
anxiety, tremors, serotolinergic effects
Drug used for post op shivering
Meperidine
Codeine dosing
15-60 mg q4h
Codeine usage
mild to moderate acute pain; antitussive
Codeine metabolism
major CYP 2D6 substrate–if pt lacks enzyme they won’t experience benefits
Codeine route
PO only
Hydrocodone route
PO only
Hydrocodone dose
5-10 mg q4-6h
Hydrocodone usage
acute mod to severe pain in pts w/ limited opiod use
Hydrocodone combos (immediate release)
Vicodin (Hy+APAP)
Vicoprofen (Hy+ibuprofen)
Hydrocodone combos (extended release)
Zohydro (ER 12hrs)
Hysingla (ER 24 hrs)
Fentanyl routes
transdermal ,IV, lozenge, buccal, intranasal, sublingual, epidural
Fentanyl dose
IV: 25-50 mcg q2-3 h
Fentanyl metabolism
- metabolized by CYP3A4
- preferred agent in liver failure
- high potency and lipid solubility=rapid onset
Fentanyl adverse effects
bradycardia and chest wall rigidity
Partial agonist med
buprenorphine
Antagonist action
- Compete with endogenous and exogenous opiods at mu receptors
- prevent or reverse opioid-induced side effects
Naloxone usage
- to reverse toxic effects of agonists and agonist-antagonist
- may be used orally to prevent opioid-induced constipation
Naloxone disadvantages
- repeated dosing may be necessary based upon half-life of agonist
- Poor systemic bioavailability due to extensive first pass
Naltrexone route
IM depot and PO
Naltrexone usage
opioid dependence (if they slip up and take opioid it won't have intended effect) NOT for acute reversal of toxic effects
Naltrexone adverse effects
Hepatotoxic