what is a ug?
ug means the same as mcg. ug and mcg are both symbols for 'micrograms'. The correct symbol for microgram is actually g. However, there is no way of typing that on a keyboard, so they came up with other versions, two of which are ug and mcg. If you wish to convert micrograms (ug or mcg) to milligrams, you can use this converter: