Converting between percentage concentration and mg/mL strengths

%w/v → mg/mL

x10

mg/ml → %w/v

÷10

A 35-year-old woman has been prescribed gentamicin eye drops at a concentration of 3 mg/mL to treat a bacterial eye infection.

Calculate the concentration of gentamicin in %w/v. Give your answer to one decimal place.

0.3% w/v

A 23 year old male has been prescribed dexamethasone 0.1%w/v eye drops to treat inflammation in the eye.

Calculate the concentration of the eye drops in mg/mL.

1 mg/ml

A 28-year-old man has been prescribed chloramphenicol 0.5% w/v eye drops to treat bacterial conjunctivitis.

Calculate the concentration of chloramphenicol in mg/mL.

5 mg/mL