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Recently, I had patients come in with generic latanoprost that cost them anywhere from $4 to $80 (all made by a subsidiary of Pfizer Inc.). Generic latanoprost is also available online at drugstore.com for $20 per bottle (even less for a 90-day supply).
Xalatan (latanoprost) is a prostaglandin analogue ophthalmic solution used to treat pressure in the eye (glaucoma, ocular hypertension) by decreasing liquid in the eye. Xalantan is available as a generic drug named lantanoprost.