Careprost eye drops Bimatoprost Ophthalmic Solution has been shown to be beneficial for achieving longer, thicker, and fuller eyelashes in those with weak lash growth. Applying Careprost to the lower eyelid is not advised. Administer Careprost once daily. After two months of administration, results are typically noticeable, although it often takes three to four months to get the desired results. To keep the ideal length or density, apply Careprost once a week after it has been reached. Your eyelashes will return to their original condition if you stop using Careprost altogether. The medicine must be dropped into the eye for glaucoma treatment, not just the eyelid as with eyelash treatment.