The current study, which was designed to control the release of bupropion hydrochloride with various ionic and nonionic Eudragit
grades in matrix technology, yielded attractive results. The tablets prepared showed matching USP release profiles in the beginning and under accelerated stability conditions, thus demonstrating stable formulations. All
three Eudragit polymers tested showed strong retardant properties. Among the polymers, the aqueous dispersions were more effective
than the powder grade. Dissolution profiles within specifications were achieved at low polymer levels of 15%. Thus, excellent
formulation options are available for highly soluble actives, particularly for highly dosed actives that result in low tablet
weights. The strength of these formulations is evidenced by the growing number that is available on the international market.
Furthermore, regulators require extended-release bupropion hydrochloride tablets to demonstrate 40% ethanol resistance, which
was proven for all tested Eudragit formulations.
Table VI: Assay of bupropion hydrochloride under initial and three months accelerated storage stability conditions.
Eudragit polymers are well estabilshed in pharmaceutical coating applications. The current study showed that Eudragit polymers
also can be used for matrix applications for controlling the drug release. Eudragit polymers enable the realization of small
dosage forms with high drug content. The current study showed that Eudragit polymers can be used to formulate matrix systems
with unique dissolution characteristics and superior tablet properties.
Table VII: Dissolution conditions for bupropion hydrochloride ethanol resistance as per FDA.
Shripad Gadhinglajkar is head of research and development projects in the formulation and development group, Gopeshkumar Singh is an assistant
manager for formulation development, Smitha Shetty is an assistant manager in the analytical department, and Brigitte Skalsky* is a global marketing manager of pharmaceutical services, all at Evonik Röhm, Kirschenallee, 64293 Darmstadt, Germany, tel.
+49 6151 18-4389, fax +49 6151 18-844389, firstname.lastname@example.org
*To whom all correspondence should be addressed.
1. D. Gallardo and M. Assmus, Pharma Polymers News Bull. (12), 1–2 (2005).
2. B. Skalsky, Pharma Polymers News Bull. (16/01), 2–3 (2009).
3. Eudragit Application Guidelines, (Evonik Röhm Pharma Polymers, Darmstadt, Germany, 11th ed., 2009).
4. The Merck Index, M.J. O'Neil, Ed. (Merck Research Laboratories, Whitehouse Station, NJ, 14th ed., 2006), p. 246
5. Physician's Desk Reference, J. Reed, Ed. (PDR Network, Montvale, NJ, 63rd ed., 2009), p. 1653
6. USP 32–NF 27 (US Pharmacopeial Convention, Rockville, MD, 2009), p. 1723
7. FDA, Individual Product Bioequivalence Recommendations, Bupropion Hydrochloride Extended Release Tablets (Rockville, MD, April 2008).
8. S. Bodinge et al., poster, AAPS (Los Angeles, 2009).
9. R. Meyer and A. Hussain, presentation, FDA's ACPS Meeting, (Rockville, MD, 2005).
10. D. Gallardo, M. Assmus, and B. Skalsky, presentation, CRS Annual Meeting (Miami, FL, 2005).