PAIN-OPIOIDs Flashcards
What if Pt is intolerant to one opioid?
Can try another class.
- Phenanthrenes- PHINES
- Phenylpiperdine- ANIL/YL/DINE
- Diphenlyheptan- ADONE/PHENE
What is difference btwn opioid and opiates?
Opiates -natural opium morphine.
Opioids- synthetic- methadone and semisynthetic- derived from morphine (heroin)
What is active metabolite of most Opioids, thus ideal to just give this?
Codeine to MORPHINE/ Via liver metab.
Excreted via Kidney.
What are pharmacokinetic importance of opioids?
Some have HIGH 1st pass metabolism.
Codeine reduced-thus n/v instead of morphine
What is important with morphine as far as doses?
Use less due to HIGH renal clearance
What is route of opioid administration?
ALL- PCA- self administered button if IV not poss.
What are benefits of Short vs Long acting opioids?
SA- LESS SE. Always start 1st to determine pt tolerance. LA- less peaks, steady, less end of dose failure, inc adherence.
What inhibit the release of excitatory transmitters from the
primary afferents & directly inhibit the dorsal horn pain
transmission neuron
Opioids
Why do Full agonist have high potency and addictive?
- Reinforcing.
- No ceiling effect
- They don’t knock each other off, 2x effect if taking 2
What is MC drug effect of full agonist opioids?
PSNS and anticholingeric- euphoria, vomit, dec pain sensation, alter consciousness.
LARGE- bradycardia, hypotension, non responsive, pinpoint pupils, flaccid, cyanotic, pulmonary edema
What is reason for large doses to produce same effects?
Tolerance
What is the normal physiological response with opioids?
Withdrawal. NOT always abuse. ex. Cancer PT.
Both reversible.
Titrate down slowly
What SE do people not develop a tolerance?
- Miosis- constriction of pupil
- Constipation
- Seizure Convulsions-
always have these, the rest need high dose
What are the 5 C of addiction?
Chronic use. Loss of Control, Compulsive use, Craving, Continued despite harm 50% who take opioids for 3m, wil cont. for 5y
In order to choose a diff drug or dose, what is used?
Morphine equivalent.
But never start at that max dose.
10-50% morphine and titrate up
If treat pain is it ok to give less of another type of opiod?
Caution. BUT can give less or more of opiod. No potency myth
What is the peak of effect of morphine?
90min after bolus. Accumulation = less pain Strongest to weak opioid Fentanyl Methadone- Dolphine Hydromorphone- Dialuid Oxymorphone Meperidine-Demrol Oxycodone- Percocet+APap Morphine Codeine Hydrocodone-Vicodin
What is scary about Hydrocodone/Vicodin?
Often combo with APAP.
- Pt can OD on APAP if pain not changing
- INC sedation then codeine
Is Tramadol addictive?
yes it is a synthetic partial agonist.
Still abuse potential. AVOID: ELDERLY**