Bimatoprost is a powder, which is very soluble in ethyl alcohol and methyl alcohol and slightly soluble in water. LUMIGAN® 0.03% is a clear, isotonic, colorless, sterile ophthalmic solution with an osmolality of approximately 290 mOsmol/kg. LUMIGAN® 0.03% contains Active: bimatoprost 0.3 mg/mL; Inactives: benzalkonium chloride 0.05 mg/mL; sodium