EMD Serono, Inc. an affiliate of Merck KGaA, Darmstadt, Germany, announced the submission of a New Drug Application (NDA) to the US Food and Drug Administration (FDA) for Cladribine Tablets, EMD Serono’s proprietary investigational oral formulation of cladribine, as a therapy for reducing relapses in people with relapsing forms of multiple sclerosis (MS).