- 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