L6 food-drug interactions

4 important questions on L6 food-drug interactions

Take drug on .. Full stomach or empty stomach?

  • Delayed gastric emptying --> decreased absorption rate
  • effect on bio-availability depends on (a.o.):
    • acid stability
    • dissolution behaviour in stomach omhoog/omlaag

Effects of high fat meals on drug absorption

  • Fat delays gastric emptying --> absorption also delayed
  • with hydrophilic compounds, effects on bio-availability usually less pronounced
  • lipophilic compounds often affect bio-availability, but not always in a similar direction

Specific diets and eating habits; problems may be expected with:

  • Supplements containing much calcium, magnesium, iron or zinc
  • vitamin-preparations
  • fibers
  • herbs
  • extensive weight loss
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Drug-food interaction ...key massages

  • Chronic drug use is often associated with malnutrition and deficiencies
  • polypharmacy is an important risk factor and elderly are specifically at risk
  • causality often not clear
  • awareness of apparent drug-food interactions can help to improve patient care

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