According to the WHO treatment schedule, Bitot's spots are treated with Vitamin A at a dosage of 2 lakh IU orally or 1 lakh IU intramuscularly, immediately on diagnosis and repeated the following day and 4 weeks later, for children above 1 year of age. This includes children of 8 kg or more, as children less than 8 kg and less than 1 year of age are given half the above dosage. Though oral treatment is recommended, vitamin A is given intramuscularly in cases of repeated vomiting and severe diarrhoea. Ref: Ophthalmology, By A. K. Khurana, 3rd Edition, Page 416, 417.