question: A 40 year old lady takes warfarin for DVT prophylaxis. She was given ceftriaxone for dental infection after which she experienced per vaginal bleed and dark coloured urine. This is due to?
opa: Ceftriaxone inhibits warfarin metabolism
opb: Gut flora inhibited by ceftriaxone
opc: Ceftriaxone is an enzyme inducer
opd: Both have additional thrombocytopenic effect