• Anticoagulants like warfarin and heparin
  • Epilepsy medication, especially Dilantin
  • Gout medication, allopurinol and colchicine
  • Antihypertensives, diuretics, beta blockers
  • Anti-inflammatories, especially prednisone
  • Cholesterol and lipid lowering medication
  • Mood changing medication like Prozac, lithium, tricyclic antidepressants
  • Chemotherapy
  • Thyroid medication
  • Oral contraceptives, especially the ones with high amount of progestin
  • Diet pills, street drugs like cocaine, high dosage use of vitamin A