Definition: - Polymer comprised of monomers linked to one another through functional group and have unstable linkage in the backbone. Biodegradable polymer degrading in biological fluid with release of dissolved or dispersed drug.
Disadvantage of non biodegradable polymer
-Surgical removal of drug depleted polymer is difficult.
-Toxic
- Not achieved constant rate of drug release.
Advantage of biodegradable polymers
-Not require surgical removal of the drug.
-Breakdown products are natural and biocompatible. So, there is no toxicity.
-It give constant drug release.
-Localized delivery of drug
-Sustain delivery of drug
-Stabilization of drug
-Increase drug permeability
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