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HPMC is a semi-synthetic polymer derived from cellulose. In its ophthalmic formulation, it is commonly used as a thickening and emulsifying agent. The specific formulation of HPMC ophthalmic solution typically includes a concentration range of 0.3% to 0.5% HPMC, along with other excipients to stabilize the solution and enhance its performance. The USP designation indicates that the product meets the standards set by the United States Pharmacopeia, ensuring its quality, safety, and effectiveness.