The question, as stated, cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider 10 millilitres of air and of water. They will have very different masses.
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10ml
One milliliter is one gram of something with a density of one. Most medicines have a density very near one. 20 mg is 0,020 grams so 0,020 milliliters twenty micro liters (not very much)
1
10ml is 10cm3
1cl = 10ml 250cl = 250 x 10ml = 2500ml