Orbenin Ophthalmic Eye Ointment 16.67% w/w is a sterile off-white, viscous stable suspension of Cloxacillin Benzathine in a non-irritant ophthalmic base with 3% aluminium stearate. It is presented as tubes containing 500 mg cloxacillin (16.67% w/w) as the benzathine salt, in 3 g of suspension.