RT Journal Article SR Electronic T1 A case of dapsone-induced methaemoglobinaemia JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 519 OP 521 DO 10.7861/clinmed.2020-0364 VO 20 IS 5 A1 Yee Ann Tan A1 Kai Choon Ng A1 Seng Wee Cheo A1 Tee Tat Khoo A1 Qin Jian Low YR 2020 UL http://www.rcpjournals.org/content/20/5/519.abstract AB Methaemoglobinaemia is an uncommon but potentially serious condition. It can be caused by congenital or acquired cause. Drug-induced methaemoglobinaemia is the commonest cause of acquired methaemoglobinaemia. The clinical signs and symptoms of methaemoglobinaemia include dyspnoea, desaturation, presence of saturation gap, headache, nausea and seizures depending on level of serum methaemoglobinaemia. We illustrate a case of dapsone-induced methaemoglobinaemia and its successful treatment by intravenous methylene blue.