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Later Ayds were infused with phenylpropanolamine, a decongestant also used for urinary incontinence in dogs.

The act also limited sales of other starting materials such as phenylpropanolamine and ephedrine, both withdrawn from the market for other health concerns.

Two, in Korea cold remedies and other medications may still contain phenylpropanolamine, a chemical removed from medications in the U.S. in the early 2000s when a study linked it with an increased risk of stroke.

The patients may have been taking medicines with phenylpropanolamine, or ephedrine, which is common in cold remedies and raises blood pressure, which might have caused the strokes, Woo said.

Choi agreed that medications containing phenylpropanolamine and caffeine deserve extra caution.