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Medications can cause rare and dangerous allergic reactions. The FDA says that the popular painkiller acetaminophen can cause those reactions, too. The agency wants people to see a doctor quickly if they get a rash while using the drug.

Plan B One-Step, which costs around $50, will be available on pharmacy and other retail shelves without age restriction. But the much cheaper, two-pill versions will remain behind the pharmacy counter, with prescriptions required for those under age 17.

Geneticists, pharmacologist and mathematicians combine their powers to answer one of the most vexing questions in modern oncology: Why don't anti-cancer drugs always work?

Since 2007, the Food and Drug Administration has had the power to require drugmakers to continue studying the safety of their pills or other medicines as a condition for approving them in the first place. An analysis finds that many studies are behind schedule.

After analyzing 66 million shopping trips, economists think they have the answer.

The Centers for Disease Control and Prevention report women are more likely to have chronic pain. They're also more likely to shop around for a doctor who will prescribe pain pills.

A new study shows women are dying from overdoses of prescription painkillers at a much higher rate than ever before. Men still suffer more overdoses but women are catching up, fast. Since 2007, more women have died from drug overdoses than from motor vehicle crashes.

The Food and Drug Administration and the U.S. attorney's office in Colorado cracked down on more than 1,600 websites that the feds say are breaking the law in the way they're selling prescription drugs, some of them counterfeits.

Mail-order foreign pharmacies became less popular after a 2006 law helped seniors get Medicare coverage for medications. But many seniors still have trouble paying for drugs. The Maine legislature just approved a new law so its citizens can once again order drugs from Canada and Europe.

Paying doctors to prescribe particular drugs is illegal. But drugmakers pay some doctors to talk with their peers about prescription drugs.