Amneal ships generic of Voltaren Gel. BRIDGEWATER, N.J. — Amneal Pharmaceuticals LLC has launched diclofenac sodium topical gel 1%, a pain reliever for osteoarthritis, in the United States. Amneal said its product, available in a 100-gram tube, is a first-to-market generic version of Voltaren Gel from Endo International plc and has begun shipping through wholesalers and directly to the trade.