Wednesday, July 27, 2011

NSAIDS-Non Steroidal Anti Inflammatory Drugs


  • Cyclooxygenase(COX) inhibition is recognized as the most important mechanism of action.
  • COX is an enzyme that is responsible for the formation of prostaglandins and thromboxane.
  • Prostaglandins are the main mediators of inflammation alongwith leukotrienes
  • Thromboxane is a potent vasoconstrictor,released from platelets,increases platelet aggregation.
  • Leukotriene is another mediator of inflammation which is released from leukocytes,they are produced by enzyme lipooxygenase(LOX)
  • NSAIDS can only inhibit COX enzyme,they cant inhibit LOX enzyme.whereas glucocorticoids can inhibit all inflammatory mediators.
  • There are two types of COX enxymes,COX1 & COX 2.
  • COX1 is seen in almost all tissues whereas COX 2 is found in inflammed tissues
  • NSAIDS action-
  1. Analgesic
  2. Anti Inflammatory
  3. Anti Pyretic
  4. Anti Thrombotic
  • NSAIDS Side effects due to PG synthesis inhibition-
  1. Causes gastric erosion- * inhibit synthesis of gastroprotective PGs
                                              * Back diffusion of hydrogen ion in gastric mucosa
     2.  Bleeding tendencies- Due to inhibition of thromboxane synthesis
     3.  Exacerbation of asthmatic reactions-Asthmatic patients are more prone to leukotrienes,which are bronchoconstrictors.As NSAIDS inhibit PG synthesis all arachidonic acid is used to form leukotrienes.
     4.  Causes sodium & water retention.
     5.  Prolongation of labour
  • Contraindicated in- 
  1. Asthmatic patients
  2. Pregnant ladies in 3rd trimester
  3. Liver insufficiency
  4. Gastric ulcers
  5. 1 week before surgeries
  6. Cautiously used in diabetics
  • Piroxicam- Non selective COX inhibitor.Potent anti inflammatory and potent analgesic.Prolongs bleeding time.Causes gastric discomfort
           Dose-20 mg BD/OD 
           Brand name-Dolonex 10,20 mg caps.
  • Ketorolac- Non selective COX inhibitor.Potent analgesic and modest anti inflammatory.Not to be used for more than 5days
           Dose-10-20 mg 6 hourly
           Brand name-Ketorol 10 mg tab.
  • Other non selective COX inhibitors-ibuprofen;indomethacin
  • Nimesulide-Preferential COX 2 inhibitor. Doesn't exacerbate asthmatic attacks, preferred NSAID in asthmatic patients.Hepatic toxic.Gastrointestinal disturbances.Not to be given to children and pregnant ladies.
          Dose-100mg BD
          Brand name-Nimegesic100mg tab.
  • Paracetamol-Potent analgesic.Mild anti inflammatory.Gastric erosion is rare. Doesn't prolong bleeding time.contraindicated in liver insufficiency.
          Dose-0.5-1gm TDS
          Brand name-Crocin 0.5,1 mg tab.
      
   

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