Preparation and Evaluation of Sustained Release Ibuprofen Beads

Sustained release beads of ibuprofen were prepared by a capillary method using cellulose acetate phthalate, surfactants (Tween 80 and Span 80), and polymers (K 100 M Methocel and K 100 LV Methocel). These beads were formulated into capsule and tablet dosage forms. The beads did not disintegrate in simulated gastric fluid; however, they disintegrated in simulated intestinal fluid. The dissolution profiles of ibuprofen beads and dosage forms of beads (tablets and capsules) were conducted in phosphate buffer (pH 7.2) at 37°C. The beads containing Span 80 and K 100 M Methocel resulted in prolonged drug release. The preparation containing Span 80 and equal quantities of both the polymers (K 100 M Methocel and K 100 LV Methocel), also showed good sustained release properties. The formulations prepared with Tween 80 and K 100 LV Methocel released over 90% of the drug in 2 hours indicating no sustained release properties. The beads in tablet dosage form yielded slower dissolution profiles compared to the beads in capsule form which, in turn, had slower release profiles compared to the beads alone. Release of ibuprofen was much slower from tablets after one year of storage compared to tablets immediately after their manufacture.