NSAIDs Flashcards
Arachidonic Acid Cascade
Fever
- Increased synthesis of PGE2 in hypothalamus
Prostaglandins effect on renal function
- Increase renal blood flow
- Increase glomerular filtration rate
- Cause renal vasodilation
- Increase the excretion of Na+, K+, H2O
Prostaglandins effects on GI function
- Promote the secretion of mucous
- Inhibit the secretion of acid
PGI2 Hematological function
- Inhibits aggregation (antithrombogenic effects)
TXA2 Hematological function
- Induces platelet aggregation (thrombogenic effects)
NSAIDs low doses hematologic effect
- Antithrombotic effects
*inhibit thromboxane synthesis in platelets
NSAIDs high doses hematologic effect
- Thrombotic effects
*inhibit prostacyclin synthesis
Anti-inflammatory/Analgesic Agents
- Salicylates
- Para-aminophenol derivatives
- Propionic acid derivatives
- Heteroaryl acetic acids
- Enolic acids
- Indole and indene acetic acids
NSAIDs General Characteristics (most NSAIDs)
- Inhibit COX
- Analgesic, Anti-inflammatory, Antipyretic, Antiplatelet
- Absorbed from stomach, small intestines
- Metabolized by liver, excreted by kidney
NSAIDs Contraindications (most NSAIDs)
- Aspirin hypersensitivity; may have an allergy to a # of other NSAIDs
- Liver dysfunction
- Renal dysfunction
- Alcoholism, smoking (factors contributing to ulcers)
- Caution during pregnancy or during breast feeding
Salicylates
- Salicylic acid
- Aspirin
- Diflunisal
Asprin Effects
- Acetylsalicylic acid
- Analgesic, Antiinflammatory, Antipyretic, Antiplatelet
- Stimulates respiration
- Uncouples oxidative phosphorylation
- Stimulates the medullary respiratory center
- Alters acid-base equilibrium
- All other NSAIDs activity is compared to Aspirin
Asprin is used for
- Pain
- Inflammation
- Fever (pyrogen-induced and CNS response)
- Cardiac conditions to reduce blood clotting
Aspirin MOA
- Irreversible inhibition of cyclooxygenase
Aspirin Metabolism
- 80-90% plasma protein bound
- Competes w/ thyroxine, penicillin, phenytoin, naproxen, sulfinpyrazone, and bilirubin
- Hydrolyzed to salicylate in the plasma
Aspirin Side Effects
- CNS: tinnitus, vertigo, confusion, delirium
- GI: nausea and emesis, local gastric irritation w/bleeding
- Hepatotoxicity
*prolonged high doses, viral infection
Aspirin Contraindications
- Aspirin hypersensitivity
- Chronic liver disease
- Gout
*has adverse effects on liver function
- Peptic ulcer
- Hemophilia, Vitmin K deficiency
- Diabetes
- Chickenpox or influenza in children
*Reyes Syndrome
Salicylism
- Aspirin overdose
Mild chronic salicylate intoxication
- Headache
- Dizziness
- Ringing in the ears
- Difficulty in hearing
- Dimness of vision
- Mental confusion
- Lassitude
- Drowsiness
- Sweating
- Thirst
- Hyperventilation
- Nausea
- Vomiting
- Diarrhea
High chronic salicylate intoxication
- Generalized convulsion
- Skin eruptions
- Marked alterations in acid-base balance
- Fever
- Dehydration
- Hyperpyrexia, sweating, vomiting and loss of water vapor during hyperventilation
Aspirin Blood levels- Effects- Toxicity chart
Aspirin toxicity treatment
- Induce emesis
- Gastric lavage
- Activated charcoal
- Hydrate
- Correct acid-base balance
Diflunisal (DOLOBID) Effects
- Antiinflammatory; more potent than aspirin
- Analgesic
- No antipyretic effects; poor CNS penetration
- Insignificant prolongation of bleeding time; less antiplatelet activity
- Less occult blood loss than aspirin
Diflunisal is used for
- Pain
- Osteoarthritis
- Rheumatoid arthritis
*is only managing the pain and inflammation of the diseases listed- not stemming the disease itself as they are autoimmune conditions
Diflunisal MOA
- Competitive inhibition of cyclooxygenase
Diflunisal Metabolism
- 99% bound to plasma albumin
- Competes w/oral hypoglycemics and anticoagulants
Diflunisal Side Effects
- Dizziness
- Nephritis
- Gastric ulceration
- No tinnitus
Diflunisal Contraindications
- Asthma
*higher incidence of complications in pts.; unknown reason
Acetaminophen (TYLENOL) is used for
- Analgesic
- Antipyretic
- Weak antiinflammatory effect
- Where aspirin and other NSAIDs are contraindicated
- Used concomitantly w/probenecid in the treatment of gout
Acetaminophen MOA
- Antipyretic; Blocks cyclooxygenase in hypothalamus only in environments w/low levels of peroxides
*high concentrations of peroxides in inflammatory lesions
- Analgesic- unknown
Acetaminophen Metabolism
- 20-50% plasma protein bound
- 90%+ is conjugated in liver w/glucuronic acid, sulfuric acid or cysteine
- Small portion is metabolized by the liver microsomal enzymes
Acetaminophen Side Effects
- Hepatotoxicity
- NO GI effects
- NO prolongation of bleeding time
- NO effects on renal function or acid-base equilibrium
Acetaminophen Acute Intoxication
- 12 hrs.
*nausea, vomiting, lethargy
- 48hrs.
*potentially fatal hepatic necrosis (dose-dependent), renal tubular necrosis, hypoglycemic coma
Acetaminophen Contraindications
- NOT FOR INFLAMMATORY CONDITIONS
- Analgesia adjunct w/other antiinflammatory agents
- Use w/caution w/liver disease
Propionic Acid Derivatives
- Ibuprofen
- Naproxen
Ibuprofen (MOTRIN, RUFIN) Effects
- Analgesic
- Antiinflammatory
- Antipyretic
- Antiplatelet (reversible)
Ibuprofen used for
- Same as aspirin
*pain, inflammation, fever (pyrogen-induced and CNS response), cardiac conditions to reduce blood clotting