Magnesium choline salicylate
Sodium salicylate
Salicylsalicylate
effective anti-inflammatory agents
probably less effective analgesics compared to aspirin
poor cyclooxygenase inhibitors compared aspirin, suggesting that these drugs may be preferable, compared to aspirin, in patients with:
asthma
bleeding predisposition
renal dysfunction (possibly -- requires close monitoring)
salicylic acid derivative
not metabolized to salicylate or salicylic acid
analgesic + anti-inflammatory activity
minimal antipyretic action
pain
osteoarthritis
rheumatoid arthritis
Development of new drug stimulated by side effects, particularly gastric irritation associated with large dose salicylate use
Primary clinical target: rheumatoid arthritis or osteoarthritis; in addition to other indications.
Diverse Classes
propionic acid derivative | ibuprofen |
pyrrolealkanoic acid derivative | tolmetin |
phenylalkanoic acid derivative | flubiprofen |
indole derivative | indomethacin |
pyrazolone derivative | phenylbutazone |
phenylacetic acid derivative | diclofenac |
fenamate | meclofenamate acid |
oxicam | piroxicam |
naphthylacetic acid prodrug | nabumetone |
Newer NSAIDs: similar in mechanism to aspirin --
Mechanism of action: innovation of prostaglandin biosynthesis
Additional mechanisms possible:
chemotaxis inhibition
interleukin 1 down-regulation
interference with calcium-mediated intracellular processes
Unlike aspirin:
reversible inhibitors of cyclooxygenase
variable COX-I 1 -- COX-II selectivity
Celecoxib (Celebrex) is an example of a nonsteroidal antiinflammatory drug that works as a result of prostaglandin synthesis inhibition (inhibition COX-II)
Some lipoxygenase synthesis inhibition
Indomethacin & diclofenac:
synthesis reduction -- prostaglandins; leukotrienes
Mechanism of Inflammation Reduction:NSAIDs
decrease in granulocyte, basophils, mast cells mediator release
decrease vessel sensitivity to bradykinin and histamine
influence T lymphocytes lymphokine production
reversal of vasodilatation
analgesic
antipyretic
anti-inflammatory
platelet aggregation inhibition
gastric irritation -- less gastric irritation compared aspirin
nephrotoxicity
well absorbed
highly metabolized:
phase I +phase II
phase II alone: glucuronidation
Excretion: renal -- primary
biliary excretion/enterohepatic circulation
highly protein-bound (principally albumin)
Chemical issues:
some NSAIDs:
racemates (e.g. ibuprofen)
single enantiomer (e.g. naproxen)
no chiral center (e.g., diclofenac)
derivative phenylpropionic acid
rapidly cleared
highly protein-bound
high doses required for bolts anti-inflammatory as well as analgesic effects
highly hepatically metabolize; little excreted unchanged
Gastrointestinal irritation/bleeding -- less frequent than with aspirin
Total anti-inflammatory effect: reduced if ibuprofen is used concurrently with aspirin
patients with nasal polyps
angioedema
aspirin sensitivity -- bronchospasm
gastrointestinal
tinnitus
aseptic meningitis (associated with systemic lupus erythematosus)
headache
Properties:Naproxen & Fenoprofen
Naphthylpropionic acid compound
plasma protein-bound
urinary excretion -- inactive glucuronide
naproxen competes with aspirin for plasma protein mining sites
prolongs prothrombin time
relatively safe/GI upsets frequency: 20%-40%
propionic acid derivative
Of the NSAIDs, most likely to cause (still quite rare): interstitial nephritis
requires frequent dosing (qid)
Adverse Effects (Naproxen/Fenoprofen)
Adverse effects/drug interactions --similar to naproxen, (effects less common been seen with aspirin) including:
nephrotoxicity
gastrointestinal upsets
peripheral edema
rash
pruritus
CNS/cardiovascular effects
tinnitus
propionic acid derivative
good synovial concentration
extensively metabolized; some enterohepatic recirculation
efficacy: similar to aspirin and other incidents
ankylosing spondylitis
rheumatoid arthritis
osteoarthritis
topical ophthalmic: inhibition of intraoperative miosis
propionic acid derivative
some inhibition of cyclooxygenase and lipoxygenase activity
Rapid absorption;
complete hepatic metabolism
effectiveness: equivalent to other NSAIDs & aspirin; not superior to other NSAIDs
Clinical Use/characteristics: ketoprofen
rheumatoid arthritis
osteoarthritis
Major Adverse Effects: referable to the CNS & gastrointestinal tract
propionic acid derivative
very long half-life -- once a day dosing
generally: similar benefits/adverse effects compared other NSAIDs
mildly uricosuric (maybe more useful in gout compared other NSAIDs)
phenylacetic acid derivative (similar to flubiprofen and meclofenamate)
potent cyclooxygenase inhibitor -- following properties:
anti-inflammatory
analgesic
antipyretic
Rapid absorption (oral dosing); half-life -- 1-2 hours
synovial fluid accumulation
better cyclooxygenase inhibitor compared to naproxen
Clinical Use/characteristics:Diclofenac
Chronic inflammatory conditions:
rheumatoid arthritis
osteoarthritis
Chronic musculoskeletal pain
Ophthalmic solution: prevention of postoperative ophthalmic inflammation
Adverse effects (frequency -- 20%)
gastrointestinal disturbance
occult GI bleeding
gastric ulceration
transaminitis (increase serum amino transferase) occurs more frequently with diclofenac than with other NSAIDs
sulfoxide prodrug
action metabolite: acetic acid derivative
effective form: sulfide derivative (following hepatic metabolism)
sulfide derivative excreted in bile-- reabsorbed from the intestine
enterohepatic cycling accounts for 12-16 hour duration of action
Indications/Adverse Reactions:similar to other NSAIDs
More serious reactions include:
Stevens-Johnson epidermal necrolysis syndrome
thrombocytopenia
agranulocytosis
nephrotic syndrome
cholestatic liver damage
pyrroleacetic acid derivative
Effective in juvenile & adult rheumatoid arthritis and osteoarthritis
short half-life; requires frequent administration
minimal/no enterohepatic circulation
acetic acid derivative
well absorbed; good bioavailability; strongly bound to plasma proteins
similar to their NSAIDs (except for its pharmacokinetic properties)
possibly slightly less gastric toxicity (referencing ulcer disease)
prodrug
ketone converted to acetic acid derivative
half-life: > 24 hours -- once-daily dosing
may be slightly less likely to cause gastrointestinal distress compared other NSAIDs
fenamic acid derivative
short half-life
generally same adverse effect profile compared to other NSAIDs
causes increased oral anticoagulant effect
contraindicated in pregnancy
efficacy/safety: not establish in young children
treatment with meclofenamate should not exceed one-week
reasonable analgesic; less effective than aspirin in treating inflammation
half-life: 40-80 hours; once-daily dosing or every other day
rapid absorption
primarily excreted as glucuronate conjugate
gastrointestinal upset: frequency = 20%
Other Adverse Effects:
dizziness
rash
headache
tinnitus
the dosages > 20 mg per day ® increased peptic ulcer incidence
ankylosing spondylitis
osteoarthritis
rheumatoid arthritis
Primary Reference: Katzung, B. G. and Furst, D. E. Nonsteroidal Anti-Inflammatory Drugs; Disease-Modifying Antirheumatic Drugs; Nonopioid Analgesics; Drugs Used in Gout, in Basic and Clinical Pharmacology, (Katzung, B. G., ed) Appleton-Lange, 1998, pp 578-602. |
Lipsky, P.E. Rheumatoid Arthritis, In Harrison's Principles of Internal Medicine 14th edition, (Isselbacher, K.J., Braunwald, E., Wilson, J.D., Martin, J.B., Fauci, A.S. and Kasper, D.L., eds) McGraw-Hill, Inc (Health Professions Division), 1998, pp 1880-1888. |
Agudelo, C.A. Gout in Medicine for the Practicing Physician, Fourth edition, (Hurst, J. Willis, editor in chief) Appleton & Lange, 1996, pp 223-226. |