» Pilocarpine Nitrate Ophthalmic Solution is a sterile, buffered, aqueous solution of Pilocarpine Nitrate. It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of C₁₁H₁₆N₂O₂·HNO₃. It may contain suitable antimicrobial agents and stabilizers, and suitable additives to increase its viscosity.