Sunday 21 October 2012

Common important drug interactions

Warfarin

  • P450 inhibitors - increased INR bleeding

Theophylline 
  • P450 inhibitors - arrhythmias

Digoxin
  • Amidarone - arrhythmias
  • Verapamil - heart block
  • Quinidine - heart block
  • Diuretics - heart block

Beta-blockers
  • Verapamil - bradycardia
  • Diltiazem - asystole

Lithium
  • Thiazides - ataxia and fits

Oral contraceptive pill
  • Antibiotics - failure of contraception

Azathioprine 
  • Allopurinol - bone marrow failure

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