by Guest » Sat Jun 11, 2005 7:38 am
1000 µg = 1 mg.
The abbreviation mcg for µg isn't really encouraged, but it is used when the font set doesn't have the Greek letter "mu" (µ).
Some people use ug.
It just moves the decimal point 3 places, so
150 µg = 0.15 mg, and
125 µg = 0.125 mg
So it is a smaller dosage, but not by a huge amount, a little smaller.