An independent safety monitoring board decided that elevated liver enzymes in some patients raised questions about whether the drug was too toxic.

FORBES: Wyeth's Worries

Zetia and Vytorin are for patients who don't get enough benefit from these other drugs, or who can't take high doses of statins because of side effects like achiness or elevated liver enzymes.

FORBES: The Vytorin Consensus

Merck also announced it had canceled a mid-stage study of its migraine drug telcagepant, viewed as promising, because of elevated levels of liver enzymes in study participants.

FORBES: Earnings