General pharmacology

Drugs undergoing complete First pass metabolism

Drugs undergoing complete first pass metabolism when taken orally

'F I L T Hy'

  • First pass metabolism
  • Isoprenaline
  • Lignocaine
  • Testosterone
  • Hydrocortisone

4.5

Enzyme inducers

 ' P RAGA

  • Phenylbutazone
  • Anticonvulsants
  • Rifampicin
  • Griseofulvin
  • Alcohol
3

Enzyme inhibitors

 ' COMIC CASE '

  • Cimetidine
  • Omeprazole
  • Metronidazole
  • Isoniazid
  • Chloramphenicol
  • Ciprofloxacin
  • Allopurinol
  • Sulphonamides
  • Erythromycin

 

3

Drugs metabolized by acetylation

' SHIP'

  • Sulfonamides including dapsone
  • Hydralazine
  • Isoniazid (INH)
  • Procainamide

Acetylator polymorphism:Some individuals are slow acetylators and some are fast acetylators.The drugs metabolized by acetylation may become ineffective in fast acetylators and cause toxicity in slow acetylators.
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