The Mectizan Donation Program is an international program to eliminate river blindness and lymphatic filariasis (LF), primarily funded by Merck & Co., Inc., Kenilworth, N.J., U.S.A.,* with additional support from GSK. For LF, Mectizan is co-administered with albendazole, which is donated by GSK. *Merck is known as MSD outside the USA and Canada.