Ursula Street, PO Box 6510 Mail Stop F-731, Aurora, CO 80045, USA. Detergent preservatives such as benzalkonium chloride (BAK) have been used for decades in many ophthalmic preparations owing to ...

Many eyedrop brands contain chemical preservatives such as benzalkonium chloride, or BAK, as well as other ingredients. When buying eyedrops or eye ointments, consumers should always check the ...