Big pharma merger today and no it does not involve Valeant – those days are over – at least for now. Medivation Inc (NASDAQ: MDVN) is soaring around 20 percent as Pfizer Inc. (NYSE:PFE) has bid $14 billion for the company. The merger widely speculated over the weekend was announced this morning. So just how much synergies are we talking about? Here is what the sell side is saying. Medivation Inc (NASDAQ: MDVN) – Analysts React Goldman Sachs The FT reported that PFE is close to finalizing a $14bn deal to acquire MDVN. While we take no view on the likelihood of such a…