You need to compound Drug X to make a concentration 100 mg/ml and a total quantity of 50 mL. How many 250 mg tablets must you dissolve in liquid to make the compound?

Question

You need to compound Drug X to make a concentration 100 mg/ml and a total quantity of 50 mL. How many 250 mg tablets must you dissolve in liquid to make the compound?

Answer 1

Use the given equation, but include the units:

50 ml * 100 mg ml^-1
= 50 * 100 mg (after the ml cancelled out)
= 5000 mg

No. of 250mg tablets required
= 5000 mg / 250 mg-tablet^-1
= 5000 /250 tablets
= 20 tablets