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We report the case of an 88-year old woman referred for evaluation of increased INR. Surprisingly supratherapeutic levels of rivaroxaban was detected. Upon scrutiny of the patient's medical history, a drug-drug interaction between amiodarone and rivaroxaban persisting 3 weeks after cessation of amiodaron remains the prime suspect causing the clinical picture. Both INR and rivaroxaban levels returned to normal within 3 days of cessation of rivaroxaban. The case highlights that rivaroxaban, although highly variably, does affect INR. Further