DUBLIN – Sanofi SA ratcheted up the tension in its takeover battle with Medivation Inc. by seeking to oust the Medivation board and replace it with its own slate of candidates. It disclosed Wednesday that it had filed preliminary consent solicitation materials with the Securities and Exchange Commission (SEC) in a bid to replace Medivation’s directors with what it described as “eight independent and highly-qualified candidates who are willing to fully and fairly evaluate all of Medivation’s strategic options.” San Francisco-based Medivation quickly responded by unveiling plans to file consent revocation materials with the SEC.