Which statement about Alphagan P brimonidine contains purite?

• A. Alphagan P contains purite
• B. Brimonidine contains purite
• C. Purite is not used
• D. Alphagan P 0.1%, 0.15% contains purite!

Answer: (D)

Purite is a preservative used in some eye drops that is designed to be gentler on the eye by breaking down into saline and water after light exposure. Alphagan P brimonidine is formulated with Purite as its preservative, and this is specifically true for the 0.1% and 0.15% strengths. That makes the statement about Alphagan P at those concentrations containing Purite the most accurate and informative answer. While Alphagan P as a product uses Purite, not all brimonidine formulations do, so a broader claim that brimonidine always contains Purite isn’t correct. The idea that Purite isn’t used is incorrect, and noting just that Alphagan P contains Purite without specifying the concentrations is less precise.