Your Side Effects May IncludePropranolol (Inderal) side effects
This side effect is printed on the FDA label for Propranolol. It was a question in our daily quiz, where you pick the real side effect from four choices.
Low blood sugar, especially in children who haven't eaten
It can also hide the racing heart that usually warns you your blood sugar is low.
“Propranolol therapy, particularly when given to infants and children, diabetic or not, has been associated with hypoglycemia especially during fasting as in preparation for surgery.”
Don't skip meals, especially children. Don't stop suddenly, which can trigger chest pain or a heart attack.
688 reports to the FDA's adverse event system mention low blood sugar. 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.