One of the hottest contenders was Bristol-Myers Squibb 's (nyse: BMY - news - people ) Vanlev, but that drug proved to be no more effective than other medicines and also caused a potentially deadly swelling of the throat and mouth in some patients.

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What to watch for: Upset stomach, cough, dizziness, drowsiness, ear pain or infection, swelling of the mouth or throat.

CNN: How to deal with your child's asthma

But deadly side effects--a swelling of the nose and throat that can cause suffocation--turned up in late-stage clinical trials.

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According to Schering-Plough (nyse: SGP - news - people ) spokeswoman Denise Foy, the label will now report that a rash and a condition called angioedema, a swelling of the hands, feet, lips and throat, were observed in patients who have taken the drug since it was approved.

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