Standard Ophthalmic Drop Volume
Bromfenac 0.9% ophthalmic solution delivers approximately 20 drops per milliliter, which is the standard for most ophthalmic solutions.
Drop Volume Calculation
For the 1.7 mL bottle of bromfenac 0.9%, this translates to approximately 34 total drops in the entire bottle (1.7 mL × 20 drops/mL = 34 drops).
Clinical Context
- Standard drop volume: Each drop from an ophthalmic dropper bottle is approximately 50 microliters (0.05 mL) 1
- Drops per mL: This yields approximately 20 drops per milliliter for standard ophthalmic solutions
- Bottle contents: The 1.7 mL formulation contains 1.035 mg bromfenac sodium per mL (equivalent to 0.9 mg bromfenac free acid) 1
Important Practical Considerations
The actual number of drops delivered can vary based on:
- Dropper tip design and manufacturing tolerances
- Bottle angle during administration
- Patient technique
- Solution viscosity and surface tension
- Temperature of the solution
Clinical dosing implications:
- Bromfenac is typically dosed once or twice daily
- At once-daily dosing, a 1.7 mL bottle provides approximately 34 days of therapy for one eye
- At twice-daily dosing, the bottle provides approximately 17 days of therapy
The 20 drops/mL standard is widely accepted across ophthalmic formulations and is used for calculating medication supply duration in clinical practice.