II. Adverse Effect: Increased Drug effect (common)
- Azathioprine (Imuran, Bone Marrow suppression risk)
- Benzodiazepines and other Sedative Hypnotics (Sedation risk)
- Digoxin (Digoxin Toxicity risk)
- Methotrexate (Bone Marrow suppression risk)
- 
                          Phenytoin (Ataxia and sedation risk)- Chloramphenicol
- Isoniazid
- Phenylbutazone
 
- Propranolol (Bradycardia risk)
- 
                          Sulfonylureas (Hypoglycemia risk)- Chloramphenicol
- Phenylbutazone
- Warfarin
 
- 
                          Warfarin (Bleeding risk)- Aspirin
- Metronidazole
- Phenylbutazone
 
