- Diuretics, amphotericin B
- Added potassium loss. Watch for hypokalemia.
- Digoxin
- Hypokalemia raises arrhythmia risk.
- Insulin and oral diabetes drugs
- Glucose rises; diabetes doses may need increasing.
- Warfarin
- Usually blunts warfarin's effect. Check coagulation often.
- NSAIDs and aspirin
- More GI side effects; salicylate levels shift when the steroid starts or stops.
- CYP3A4 inducers (phenytoin, carbamazepine, rifampin, barbiturates)
- Lower steroid effect; the dose may need to rise.
- CYP3A4 inhibitors (ketoconazole, itraconazole, ritonavir, macrolides)
- Higher steroid levels and side effects.
- Fluoroquinolones
- Higher risk of tendon rupture, especially in older adults.
- Vaccines
- Weaker response; live vaccines are contraindicated at immunosuppressive doses.