Merck Tallies Vytorin Switches: 27% From Zocor, 24% From Lipitor

Combined Vytorin and Zetia new prescription share is now 11%, with total prescription share at 10%, Merck reports. Global sales for the drugs were $511 mil. in the first quarter, with $332 mil. from Zetia and $179 mil. from Vytorin.