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# Calculation of solutions watch

You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.

The required dose is 50mg/kg body weight and your patient weighs 80kg.

a) What volume of drug solution do you inject in ml?
b) how heavy would the patient have to be before you needed more than one ampoule to prepare the injection in kg?
2. (Original post by Jaanu)

You are preparing an injection of a drug supplied as 5ml ampoules containing a solution at a concentration of 1mg/ml.

The required dose is 50mg/kg body weight and your patient weighs 80kg.

a) What volume of drug solution do you inject in ml?
b) how heavy would the patient have to be before you needed more than one ampoule to prepare the injection in kg?
So for the first one, use the information in the first part. You've got 5 ml in each ampoule and there is 1 mg of drug in each ml. How many mg of drug, therefore, are there in 5 ml? Once you've worked this out, see how many of these ampoules you need per kg of body weight (i.e. 50 mg/your answer to the first question). The rest should be easy.

It's against the rules to just provide answers so I'm trying to guide you without giving it all away.

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