Polyquad ® is a detergent-type preservative derived from BAK. Polyquad was formulated in the mid 1980s by Alcon as a preservative for contact lens storage solutions. It was developed because ...

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 ...