What effect do broad-spectrum antibiotics have on the anticoagulant activity of coumarin drugs when given together?

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Decreased effect due to accelerated liver metabolism of the drugDecreased effect caused by higher protein binding in the bloodstreamEnhanced effect resulting from diminished vitamin availabilityEnhanced effect owing to reduced renal clearance of the anticoagulant

Explanation

Broad-spectrum antibiotics can increase the anticoagulant effect of coumarin drugs by lowering the levels of vitamin K-producing bacteria in the gut, which reduces vitamin K availability and thus enhances anticoagulation.