MDLinx operates an online network of 32 medical portals, 36 consumer health portals, and 740 email newsletters.

So-net M3, meanwhile, is a Japanese provider of online pharmaceutical marketing services with a public equity market capitalization of approximately $1.1 billion. MDLinx has used its proprietary online pharmaceutical marketing software, Visits, to break into the online pharmaceutical marketing market in Japan, the second largest pharmaceutical market after the US.

MDLinx CEO Dave Rothenberg said of the agreement, Our market research business is strengthened by access to Asian physicians, our sponsorship business can deliver more extensive international reach, and we can provide clients with more interactive online marketing services.

The merger with So-net, which is 60% owned by Sony Communication Network, is expected to close before the end of June 2006.