Menorrhagia: case reportA 41-year-old woman developed menorrhagia during treatment with rivaroxaban for pulmonary embolism and deep venous thrombosis.The woman, who presented with severe vaginal bleeding, hypotension, vertigo and tachycardia, was admitted to a hospital in Iran . She had a history of pulmonary embolism, deep venous and protein-C deficiency as a rare genetic feature and was prescribed with warfarin for recurrent nature of the thrombosis. However, she failed to co-operate to monitor the time of Prothrombin. Hence, the physician replaced warfarin with oral rivaroxaban 15mg two times a day for about 21 days, and then 20mg per day for next following days. Her menstrual cycles were healthy during treatment with warfarin. Approximately 2 months after the onset of the treatment, she had suffered from menorrhagia i.e severe vaginal bleeding and was admitted. Laboratory tests showed the following: ESR 40mm/h, CRP 4 mm/L, prothrombin Time 12s, INR 1.0, BUN 7 mg/dL, creatinine 2.2 mg/dL and haemoglobin 6 g/dLThe woman received two blood bags were provided for her low haemoglobin levels according to laboratory findings [outcome not stated].