Study: Combo cholesterol drug no better than generic

• Story Highlights
• Vytorin combines two cholesterol drugs, Zetia and Zocor
  
• Study found it no more effective than high doses of generic Zocor alone
  
• Merck, Schering-Plough developed Vytorin together and share profits from sales
  
• Companies are conducting additional, larger studies of the drug
  
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