For some products, it is the only ingredient, the FDA said in a news release issued Thursday. Others contain oral phenylephrine and acetaminophen, dextromethorphan or another active ingredient.
Still, they’re more difficult to obtain than over-the-counter antihistamines. Pseudoephedrine (e.g., Sudafed) is another class of decongestants. It’s offered in limited forms in certain states.