25gm

20

1 gram (gm.) = 1 millilitre (ml.)

1,000 milligram (mg.) = 1 gm.

So your answer is 2.5g

1,000 milligram (mg.) = 1 gm.

So your answer is 2.5g

If you are discussing medication, it would depend on the medication. Different medications come in different strengths some have as much as 20 mg per ml, some as little as 0.1 mg per ml.