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When you take a blood thinner like warfarin, you need to avoid anything else that also thins the blood. The major drug class that fits this is the pain reliever class. Tylenol is considered the only safe drug to take with warfarin - aspirin, ibuprofen, and naproxen all cause extra blood thinning.

Here are some medicines which might make your warfarin level go down:
  • Antithyroid medicines
  • Azathioprine
  • Carbamazepine
  • Dicloxacillin
  • Glutethamide
  • Griseofulvin
  • Haloperidol
  • Nafcillin
  • Oral contraceptives
  • Phenobarbital
  • Rifampin
  • Vitamin K
Here are some medicines which might make your warfarin level go up:
  • Allopurinol

  • Anabolic steroids
  • Amiodarone
  • Cephalosporins
  • Cimetadine
  • Ciprofloxacin
  • Clofibrate
  • Clopidrogel
  • Diclofenac
  • Disulfiram
  • Erythromycins
  • Fluconazole
  • Fluorouracil (5-FU)
  • SSRIs such as Prozac or Zoloft
  • Glucagon
  • Influenza virus vaccine
  • Metronidazole
  • Macrolide antibiotics
  • Omeprazole
  • Sulfamethoxazole/Trimethoprim
  • Tamoxifen
  • Thyroid hormone
  • Tolbutamide
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14y ago
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12y ago

vitamin k

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Q: Drugs not to take while on warfarin?
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