PT - JOURNAL ARTICLE AU - Yee Ann Tan AU - Kai Choon Ng AU - Seng Wee Cheo AU - Tee Tat Khoo AU - Qin Jian Low TI - A case of dapsone-induced methaemoglobinaemia AID - 10.7861/clinmed.2020-0364 DP - 2020 Sep 01 TA - Clinical Medicine PG - 519--521 VI - 20 IP - 5 4099 - http://www.rcpjournals.org/content/20/5/519.short 4100 - http://www.rcpjournals.org/content/20/5/519.full SO - Clin Med2020 Sep 01; 20 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.