NSAIDS, Corticosteroids Flashcards
Does Tylenol work well for inflammatory pain
No not really
What are the indications to use acetaminophen (Tylenol)
Mild to moderate non-inflammatory nociceptive pain
What is the role in therapy of acetaminophen (Tylenol)
- Fever
- Self-limiting painful conditions
- Osteoarthritis
What is the mechanism of action of acetaminophen (Tylenol)
- Analgesic effects in CNS via COX inhibition, interacts with nitric oxide containing pathways, and blocking substance P actions
- Anti-pyretic
*can use in children under 6 months
What are the adverse effects of acetaminophen (Tylenol)
- Generally well tolerated
- Rare: Stevens-Johnson syndrome / Toxic Epidermal Necrolysis (TEN)
- BBW: Hepatotoxicity
*can overdose
What are the roles of acetaminophen (Tylenol)
- Severe rash skin reactions SJS TEN = CI
- Caution in renal impairment
- BBW: Severe Hepatotoxicity
*doses >4 grams a day
*risk of dosing errors is 10x higher with injection
What is the maximum daily dose of acetaminophen
3,000mg per day
If someone overdoses on acetaminophen what is the antidote
- N-acetylcysteine
*restores hepatic glutathione
*helps to breakdown Tylenol - Use Rumack-Matthew nomagram
*input the serum acetaminophen level and time since ingestion to determine need for NAC
What are the COX-1 and 2 Non-selective NSAIDS
- Ibuprofen (Advil, Motrin)
- Naproxen (Aleve, Naprosyn)
- Indomethacin (Indocin)
- Ketorolac (toradol)
*all have more GI problems
What are the Increased COX-2 Selectivity NSAIDS
- Celecoxib (celebrex)
- Diclofenac (voltaren)
- Meloxicam (mobic)
*2 is the most selective COX-2 available (less GI irritation)
What are the indications for NSAIDs
- Mild to moderate pain suspected to be inflammatory, headache
- Fever reduction
- Arthritis
- Gout
- Closure of the patient ductus arteriosus
What are the indications for Aspirin
- Prevention of myocardial infarcation/stroke
*affects the platelets to be more thrombotic in nature - Arthritis
- Headache
What are the anti-inflammatory effects of NSAIDS and ASA
NSAIDS
1. Reversible inhibit COX1 and or 2 and the production of thromboxane, prostaglandins, and prostacyclin
ASA
1. Irreversible COX inhibition (inhibition of prostaglandins synthesis_
*have to eliminate the platelets before the effects wear off
What are the antipyretic effects of NSAIDS and ASA
- Inhibits the synthesis of fever inducing prostaglandins in the brain
What are the platelet effects of NSAIDS and ASA
NSAIDS
1. Inhibits platelet aggression (dont stick to each other, increased risk of bleeding)
ASA
1. Inhibits thromboxane synthesis (permanent)
*need new platelets (made every 8 to 10 days)
What are the analgesic effects of NSAIDS and ASA
- Reduced prostaglandin production at injured tissue
What are the effects of the Selective COX2 inhibition (NSAIDS)
- Do not affect platelet function at usual doses
*do not inhibit platelet aggregation - Less GI irritation
- Increased incidence of edema, hypertension, and maybe MI
- Nephrotoxicity (all NSAIDS) due to interfering with auto regulation of renal blood flow
What are some pharmacokinetics pearls of NSAIDS
- Do not give and NSAID to a child <6 months old
*can effect the development of kidneys, also why we avoid in pregnancy - Highly protein-bound, typically to albumin
- Naproxen and piroxicam have longer half lives
*N (14 hours) Piroxicam (57 hours)
What is the correlation between NSAIDS and their half lives
NSAIDs with shorter 1/2 life remain in the joints longer than anticipated T1/2
What are some pharmacokinetics pearls of ASA
- First order renal elimination
- Anti platelet effects last 8 to 10 days
What are the therapeutic dosing ranges for ASA
LOW (81-325mg/day)
1. Reduced platelet aggregation
Intermediate (300-2400mg/day)
1. Antipyretic and analgesic effects
HIGH (2400-4000mg/day)
1. Anti-inflammatory effects
What are some adverse reactions of NSAIDs and ASA
- Stomach upset, abdominal pain NSAIDS <ASA
- GI bleed, clotting problems (increased bleeding time)
- Tinnitus, dizziness
- Worsening HTN, MI
- Hyperkalemia
- Impaired renal function