A 64-year-old man on warfarin (target INR 2.5) for AF is prescribed trimethoprim for UTI. Which is the safest immediate action regarding his anticoagu...

Question

A 64-year-old man on warfarin (target INR 2.5) for AF is prescribed trimethoprim for UTI. Which is the safest immediate action regarding his anticoagulation?

Accepted Answer

Arrange earlier INR check within 3-5 days and advise monitoring

Answer

Stop warfarin for duration of antibiotics

Answer

Halve the warfarin dose empirically

Answer

Switch trimethoprim to ciprofloxacin

Answer

No change required

prescribing safety assessment MCQ (SBA): Drug–Drug Interaction

A 64-year-old man on warfarin (target INR 2.5) for AF is prescribed trimethoprim for UTI. Which is the safest immediate action regarding his anticoagulation?