Eye Drop Days Supply Calculator . Pharmacies are often audited by insurance companies, and one of the areas they are audited. Like diclofenac gel 100g tubes, prescriptions for 1 tube is often a months supply. eye drop calculation chart Bumba CBD Suburban from cbdsuburban.com For these liquid solutions and suspensions for the ear and the eye, the number of drops in each ml must be known to ensure that the day's supply is correct and that the patient is given enough product to complete their recommended treatment. For inhalers, i always check how many puffs each inhaler has, some has 120, some has 200 if the patient uses 2 puffs every 4 hours with 200 puffs on the inhaler 2x6 = 12. Using a conversion factor of 20 drops per milliliter, calculate the days’ supply by dividing the total number of drops dispensed by the number of drops required for each day’s dose.