Glaxo shares pulled out of a tailspin after the pharma giant defended its second biggest selling drug, Avandia, against claims that it triggers heart attacks. A sharply worded letter from the company's chief medical officer on the website of medical journal The Lancet pointed out that the increased incidence of heart attacks among Avandia patients—0.6%—was still very small.
And he said it was comparable to two other "gold standard" medicines used to treat type 2 diabetes. GlaxoSmithKline was up 50 cents in trading yesterday, but only after panic among investors wiped $21 billion off its market cap.The diabetes drug accounts for only 7% of Glaxo's shares, the Telegraph reports, suggesting the dive was an overreaction. (Read more GlaxoSmithKline stories.)