The Food and Drug Administration has delayed a decision on a blood thinner from Eli Lilly for a second time, raising concerns on Wall Street about the potential blockbuster medication.

The Food and Drug Administration is expected on Thursday to announce proposals for regulating the meat and milk from genetically engineered animals.

Some lawmakers and medical groups are calling for restrictions on advertisements for medical devices like artificial knees and heart stents, claiming they mislead patients.

The formula is implicated in the death of one infant, and at least 432 others have been afflicted with kidney problems.

Federal health regulators ordered new warning language for prescription drugs to treat rheumatoid arthritis, Crohn’s disease and other conditions after a dozen patients died.

Doctors continue to heavily prescribe the cholesterol drug Vytorin, though there is no proof that it helps prolong life or prevent heart attacks.

Doctors continue to heavily prescribe the cholesterol drug Vytorin, though six years after its approval there is still no proof that the drug helps patients live longer or avoid heart attacks.

The change in policy for fresh spinach and iceberg lettuce marks the first time the F.D.A. has allowed any produce to be irradiated at levels needed to protect against illness.

Federal regulators are working on a stronger label for a widely used diabetes drug, Byetta, after deaths continue to be reported despite earlier government warnings.

WASHINGTON — Despite safety concerns from parents, consumer groups and politicians, a chemical used in baby bottles, canned food and other items is not dangerous, federal regulators said Friday.