Santen Pharmaceutical Co., Ltd. engages in the research and development, manufacturing, and marketing of pharmaceuticals and medical devices in Japan, China, Asia, Europe, the Middle East, Africa, and internationally. Its product portfolio includes tafluprost/timolol maleate, a prostaglandin F2a derivative and a beta-adrenergic receptor blocker for the treatment of glaucoma and ocular hypertension; and ciclosporin, an ophthalmic emulsion for the treatment of vernal keratoconjunctivitis, as well as latanoprost, an ophthalmic emulsion of a prostaglandin F2a derivative filed for marketing approval for the treatment of glaucoma and ocular hypertension; and epinastine hydrochloride, a histamine H1 receptor antagonist filed for marketing approval for the treatment of allergic conjunctivitis. The company also offers netarsudil mesylate/latanoprost, a fixed dose combination drug of a ROCK inhibitor and a prostaglandin F2a derivative which is in phase III clinical trial for the treatment of glaucoma and ocular hypertension; and sepetaprost, a prostaglandin analogue eye drop drug that is in phase III clinical trials for the treatment of glaucoma and ocular hypertension. In addition, it develops oxymetazoline hydrochloride, a direct-acting alpha adrenergic receptor agonist which is in phase III clinical trial for treatment of ptosis; and omidenepag isopropyl, an EP2 receptor agonist that is in phase III clinical trial for the treatment of glaucoma and ocular hypertension. Further, the company offers atropine sulfate, a non-selective muscarinic antagonist that is in phase II/III clinical trials for the treatment of juvenile myopia; olodaterol hydrochloride, a ß2 receptor agonist that has completed phase 1/2a clinical trial for the treatment of a dry eye; and sirolimus, an ophthalmic suspension which is in phase 2a clinical trial for the treatment of fuchs endothelial corneal dystrophy and meibomian gland dysfunction. The company was founded in 1890 and is headquartered in Osaka, Japan.