Example: Calculating Doses Per Bottle Example - A child is taking 10 mL of medication 2 times a day. If the full bottle contains 16 fl oz of the medication, how many days will the bottle last? Breakdown the Question Stem Into the Important Information - Bottle of medication = 16 fl oz One dose = 10 mL per dose Steps - Convert: Conversion should occur to ensure the units of measurement match 30 mL = 1 fl oz 16 fl oz x 30 mL = 480 mL per bottle Think: Solving for the number of patient doses Solve for the number of doses in the bottle by dividing the total mL in the bottle by the amount required per dose. Identify the number of doses needed per day for the patient. The patient needs 2 doses per day. Calculate: 480 mL 10 mL= total doses 48 total doses 48 (total doses) 2 (doses per day) = 24 days Solution - The medication will last 24 days at 2 doses of 10 mL per day