Homopolymeric and interpenetrating network (IPN) hydrogel beads of ibuprofen (IBP), a nonsteroidal anti-inflammatory drug, were prepared using carboxymethyl xanthan and sodium alginate as polymers and AlCl3 as a cross-linking agent. Formation of IPN structure was examined using FTIR analysis. The effect of composition of the hydrogel beads and the amount drug load on the release of IBP was studied in acidic and phosphate buffer (PB) solution of pH 6.8. In accordance with the swelling behavior of the beads, drug release from the IPN beads in acidic solution was found to be confined within those from homopolymeric beads. On the other hand, drug release from IPN beads in PB solution was found to be less than those from the homopolymeric beads although the swelling of the beads followed the same trend as in an acidic solution. An increase in the drug load further decreased the drug release from all the beads in both the dissolution media. FTIR, XRD, and DSC analyses demonstrated the absence of any interaction between the drug and the polymers. The results indicated that IPN hydrogel beads provided more sustained release of IBP than homopolymeric beads. (C) 2011 Wiley Periodicals, Inc. Adv Polym Techn 30: 1-11, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.20199