Key TakeawaysCardinal Health exceeded fourth-quarter earnings and revenue estimates on strong sales of pharmaceuticals.The healthcare firm raised its full-year profit guidance and revenue for its Pharmaceutical and Specialty Solutions unit.Cardinal Health also boosted its share buyback plan. Shares of Cardinal Health (CAH) gained in intraday trading Wednesday as the provider of healthcare services and products posted better-than-anticipated results and raised its outlook on strong drug sales. The company re ...