The presented investigation explores the efficiency of novel transdermal drug delivery system of combination of two drugs i.e risedronate and alendronate in the treatment of osteoporosis. The nanoparticulate transdermal patch was prepared using PLGA as principle polymer which has been found to be suitable for drug delivery. The novel formulation system was found to be more efficient in lowering and maintaining the plasma calcium at a normal level when compared to a pure drug in a study carried out on an excised rat skin.