Isoniazid-induced thrombocytopenia in a patient with ocular tuberculosis

Antitubercular therapy (ATT)-induced thrombocytopenia is a rare and serious adverse drug reaction which may be fatal if not identified timely. Although rifampicin is the common culprit ATT causing thrombocytopenia, other ATTs such as isoniazid have also been reported to cause thrombocytopenia. Here, we report a case of isoniazid-induced thrombocytopenia in a 56-year-old female with ocular tuberculosis who developed multiple purpura on both upper limbs, face, and oral cavity. Her condition improved with the withdrawal of isoniazid.