“In the in vitro release experiment, carrageenan significantly decreased the release rate of acyclovir , retarded the dissolution of poloxamer 407 and slowed the gel erosion (weight loss) in a concentration-dependent manner.”
“In vivo local drug residence experiment indicated that carrageenan significantly prolonged local residence of acyclovir and further showed a synergistic bioadhesive effect with acrylic acid polymers (Carbopol).”