Prescription drug · Used for urinary tract infections

Macrobid side effects

nitrofurantoin

This side effect is printed on the FDA label for Macrobid. It was a question in our daily quiz, where you pick the real side effect from four choices.

Lung damage, sometimes after months of use

Lung reactions can come on suddenly, or slowly over months, and have been fatal.

From the FDA label

“REPORTS HAVE CITED PULMONARY REACTIONS AS A CONTRIBUTING CAUSE OF DEATH.”

Macrobid label, updated Feb 9, 2026 · Read the full label on DailyMed

What to watch for

Get help right away for fever, chills, cough or trouble breathing, especially if you take it long term.

471 reports to the FDA's adverse event system mention lung reactions. A report is not proof the drug caused it. See the query

From quiz No. 21 · October 15, 2026 · Play that quiz →

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Not medical advice. Don't stop or start a medication because of a quiz. Talk to your doctor or pharmacist. Label text and report counts from openFDA. Not affiliated with any drug maker.