Careprost 0.03% is an ophthalmic solution used to lower the pressure built within the eye and is known as intraocular pressure (IOP). Careprost is used to treat glaucoma that is caused when fluid (aqueous humor) is build up in the eye. The increase in IOP can lead to the optic nerve fibers which may cause a gradual loss of eyesight. Careprost 0.03% can increase the drainage of aqueous fluid out of the eye causing a decrease in IOP and preventing loss of sight.