Stability of tacrolimus ophthalmic solution.

Area of Science:

• Ophthalmology
• Pharmaceutical Sciences
• Drug Stability

Background:

• Tacrolimus is an immunosuppressive drug used in treating ocular inflammatory conditions.
• Ophthalmic formulations require rigorous stability testing to ensure efficacy and safety.

Purpose of the Study:

• To determine the stability of a 0.3 mg/mL tacrolimus ophthalmic solution under various storage conditions.
• To establish appropriate storage recommendations for tacrolimus eye drops.

Main Methods:

• A 0.3 mg/mL tacrolimus ophthalmic solution was prepared and stored in polypropylene bottles at 25 °C, 2-8 °C, and -15 to -25 °C.
• Samples were analyzed using high-performance liquid chromatography (HPLC) over 85 days.
• Forced degradation studies were performed to assess analytical method selectivity.

Main Results:

• Tacrolimus solution maintained at least 90% of its initial concentration for 85 days when stored at 2-8 °C and -15 to -25 °C.
• At 25 °C, the tacrolimus concentration dropped below 90% of the initial level by day 28.
• No significant differences in concentration were observed from start to end at favorable temperatures (p > 0.05).

Conclusions:

• Tacrolimus ophthalmic solution (0.3 mg/mL) is stable for at least 85 days when stored at 2-8 °C or -15 to -25 °C.
• The solution has a limited shelf-life of 20 days at 25 °C.
• Proper storage conditions are crucial for maintaining the integrity of tacrolimus ophthalmic solutions.