B.28.NSAID's, except acetylsalicylic acid. gout+pain Flashcards
list the non-selective NSAID’s
Ibuprofen Indomethacin Naproxen Diclofenac Metamizole Ketoprofen Phenylbutazone Meloxicam
what are the contraindications for NSAID’s?
GI bleeding allergy, asthma, angioedema impaired renal function congestive heart failure (COX- 2 inhibition ↑ effect) pregnancy (specifically 3rd trimester)
what are the uses of Ibuprofen?
analgesic in children
induction of ductus arteriosus closure
what is the recommended dose for Ibuprofen?
child :5mg/kg
adult: 400mg
max. 2400 mg per day
what is the uses of Indomethacin?
1st line agent for acute gout attack
induction of ductus arteriosus closure
what are the side effects of Indomethacin?
- bone marrow suppression–>thrombocytopenia, agranulocytosis
- aplastic anemia
*rarely used for inflammation
when do we give Naproxen?
menstrual cramps (management of dysmenorrhea)--> uterine relaxation control of acute gout
how is diclofenac given?
topical or oral
what are the functions of diclofenac?
- accumulates in synovial fluid–> used for musculoskeletal pain (back pain, disc herniation, osteoarthritis)
- gastroprotective- releases NO
what is risk of taking diclofenac?
prothrombotic risk
which NSAID causes hematotoxicity (granulocytosis)?
Metamizole (אופטלגין)
what is the function of ketoprofen?
inhibit LOX enzyme (↓ leukotrienes)
what is Phenylbutazone?
pyrazole derivative
potent anti-inflammatory effect
a severe side effect of Phenylbutazone
aplastic anemia
what is the inhibitory effect of Meloxicam?
COX-2>COX-1
other SE of NSAID’s
- in combination with ACE inhibitors–> renal papillary necrosis
- ↑ lithium concentrations
- hyperkalemia
- GI bleeding
- ↑BP
- ↓GFR
What is Celecoxib
selective, reversible inhibition of COX-2 enzyme
what are the functions of Celecoxib?
analgesic
anti-pyretic
anti-inflammatory
what are the adverse effects of Celecoxib
GI irritation (milder effect compared to the non-selective)
renal damage
prothrombotic effect
sulfonamide hypersensitivity
at what doses are acetaminophen safe?
<4g/day (adult)
what is the #1 cause of acute liver failure in western countries?
Acetaminophen
management of acetaminophen toxicity
N-acetylcysteine
*within 12 hours of overdose
indications for Acetaminophen (Paracetamol)
- analgesic and antipyretic effect (inhibits cyclooxygenases in the CNS)
- aspirin substitute
- osteoarthritis and RA–> slight anti-inflammatory effect (no COX inhibition in the periphery)
NO anti-platelet effects
what drug for pain can be given to pregnant women?
acetaminophen
*NSAID’s shouldn’t be given!!
list the agents used for acute gout attack
- NSAID’s: indomethacin, Naproxen
- Corticosteroids: prednisone
- microtubule assembly inhibitors: colchicine
how is colchicine given?
oral or parenteral
what is the mechanism of colchicine (as a microtubule assembly inhibitor)?
bind to tubulin–> altered microtubular polymerization–> LTB₄ ↓–> altered leukocyte and granulocyte migration
what agent has a more potent effect- indomethacin or Naproxen
indomethacin
when do we give prednisone in acute gout attacks?
when NSAID’S are contraindicated
how is prednisone given for acute gout?
intra-articular injection
oral (up to 5 days course treatment)
what are the indications of colchicine other than acute gout
chronic gout-low doses
familial Mediterranean fever
management of pericardial diseases (pericarditis, pericardial effusion)
side effects of colchicine
acute: severe diarrhea, GI pain
longer use: hematuria, alopecia, myelosuppression gastritis, peripheral neuropathy
what are the agents used for chronic gout?
- Xanthine oxidase inhibitors: Allopurinol
2. recombinant urate oxidase: Rasburicase
what are the indications for giving allopurinol and Rasburicase?
chronic gout
adjunct to cancer chemotherapy and radiotherapy
(‘tumor lysis syndrome’ may precipitate gout attack)
side effects of allopurinol
GI irritation
hypersensitivity reaction, SJS syndrome
bone marrow suppression
what are the side effects of Rasburicase?
anaphylactic reaction
methemoglobinemia in patients with G6PD
allopurinol inhibits the metabolism of..
6-MP
What is the mechanism of allopurinol?
inhibit xanthine oxidase–> ↓ purine metabolism –> serum uric acid ↓
what is the mechanism of Rasburicase
it’s a urate oxidase enzyme that catalyzes the metabolism of uric acid to allantoin–> ↓ serum uric acid