Experts say it isn't viable for drug companies that spend millions developing a new antibiotic medicine then to be told by regulators to hold it in reserve for the next emergency.

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Also exciting: a stop-smoking pill, a long-delayed inhaled insulin, an osteoporosis medicine, a sleep drug and an antibiotic that can treat infections in a single dose.

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"If we do indeed have a short supply of influenza vaccines, I think it's going to have a significant impact on the public health, " says Sara Cosgrove, director of the antibiotic management program at Johns Hopkins University School of Medicine.

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In 2010 during the H1N1 flu epidemic, the FDA warned consumers about a potentially harmful counterfeit anti-flu drug that could be a killer in two respects: It lacked any of the flu-preventing medicine it purported to be while it did contain an antibiotic similar to penicillin that can be lethal to certain people.

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The FDA warning comes after the agency reviewed a study on the drug that was published last May in the New England Journal of Medicine, as well as another study by a manufacturer of the antibiotic.

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