Use the Right Drops Per mL Conversion Factor to Avoid Days' Supply Issues

June 2015

Questions often come up about how to calculate days' supply for eye and ear drops.

The problem is figuring out how many drops per mL to use for the various products.

Many of us were taught to use 20 drops/mL for eye and ear drops...but some insurers and pharmacies use 12, 15, or 16 drops/mL.

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