(Hydroxypropyl) methyl cellulose is dissolves in water, undergoes reversible gelation upon heating, non-ionic, does not complex with ionic species and is surface active and enzyme resistant.
Hydroxypropyl methylcellulose (HPMC) also callled as Hypromellose is a semisynthetic, inert, viscoelastic polymer used as eye drops, as well as an excipient and controlled-delivery component in oral medicaments, found in a variety of commercial products