Drugs That Affect Urine Test Results

Many drugs can alter the results of a patient’s urine test for glucose, ketones, or protein.Before such a test, note which drugs your patient is taking. Then if her test results are abnormal, check with the laboratory toDrugs That Affect Urine Test Results see if one of the drugs could be the problem. This list contains drugs that commonly alter test results, falsely indicating glucosuria, ketonuria, and proteinuria.

Glucosuria

  • aminosalicylic acid
  • ascorbic acid
  • cephalosporins
  • chloral hydrate
  • chloramphenicol
  • isoniazid
  • levodopa
  • methyldopa
  • nalidixic acid
  • nitrofurantoin
  • penicillin G (large doses)
  • phenazopyridine
  • probenecid
  • salicylates (large doses)
  • streptomycin
  • tetracyclines

Ketonuria

  • levodopa
  • phenazopyridine
  • phenolsulfonphthalein
  • phenothiazines
  • salicylates
  • sulfobromophthalein

Proteinuria

  • acetazolamide
  • aminosalicylic acid
  • cephalothin (large doses)
  • nafcillin
  • sodium bicarbonate
  • tolbutamide
  • tolmetin

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