Another question that has me stumped....mg/ml?

Question

OK, so say i have to administer a medication to someone in the dosage of .2mg. It is only available in .4mg/ml. What is the correct dosage, please help me through it so that i can figure it out on my own next time, thanks!! :)

Answer 1

The correct dosage is a half of 0.4mg/ml. So you must use

0.5 ml of 0.4mg/ml.

Answer 2

0.2 mg would be contained in half a milliliter of a 0.4mg/ml (4/10 g per milliliter) solution. If you are using a syringe, you can get 1ml. syringes that are marked in 0.1 ml (1/10th ml) and 0.01 ml (1/100th ml). You would give 0.5 ml (5/10 or 1/2 ml) or half of a 1 ml syringe.
If this doesn't make sense to you, contact the prescribing physician to make sure you are giving the correct dosage.

Answer 3

algebra ratio....set up fraction with given dose, 0.4mg over 1ml .....dose needed, 0.2 mg over x(unknown) ml....set up ratio of 0.4 over 1 ml = 0.2 mg over x ml, cross multiply and solve for x....0.2 times 1 = 0.4 times x...0.2=0.4x...0.2 divided by 0.4=x...0.5=x....just make sure you set up the fractions with the same variables on top, mg, and same on bottom, ml....also btw, when you write the number .2, always use a leading zero, as in 0.2, so the number is not mistaken for 2....never use a trailing 0, as in 2.0, so the number is not mistaken for 20....reduce drug calc errors

Answer 4

0.2 mg from a concentration of 0.4 mg/ml would require you to divide 0.2 by 0.4. The units would then cancel and you'd be left with the answer of 0.5 ml.

DK

Answer 5

Available in .4mg/ml just divide by 2
Required .2mg
Answer: .2mg/.5ml

Answer 6

0.4mg/ml means in one ml, there are 0.4mg drug or 0.4 mg of drug is dissolved in 1 ml... so now, you need 0.2 ml... do your math... pls consider the frequency of giving the drug as well in ur calculation..

Answer 7

Half of 0.4mg is 0.2mg ie half ml .

Answer 8

0.2mg/(x)=0.4mg/ml
0.4mg(x)=0.2mg
x=0.5ml