Apatient requires 80 mg of risperidone the stock dose is 40 mg/10ml what volume is required

20 ml

Explanation:

The stock dose stipulates that there are 40 mg for every 10 ml of the Risperidone. Moreover, we are told that the patient requires 80 mg of this drug and we are to determine the corresponding volume that should be administered. In order to determine the volume, we use the following relation;

40 mg is equivalent to 10 ml

what about 80 mg?

40 mg = 10 ml

80 mg = ?

We cross multiply;

( 80* 10) / 40 = 800/40 = 20 ml

Thus, the required volume of the prescription is 20 ml