- P450 inhibitors - increased INR bleeding
Theophylline
- P450 inhibitors - arrhythmias
Digoxin
- Amidarone - arrhythmias
- Verapamil - heart block
- Quinidine - heart block
- Diuretics - heart block
Beta-blockers
- Verapamil - bradycardia
- Diltiazem - asystole
Lithium
- Thiazides - ataxia and fits
Oral contraceptive pill
- Antibiotics - failure of contraception
Azathioprine
- Allopurinol - bone marrow failure
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