That headline is clickbait. Metoprolol has well-documented adverse effects, and there is no evidence that doctors are secretly withholding a list of “hidden” side effects.
10 metoprolol side effects to know
Fatigue or unusual tiredness — particularly when starting treatment or increasing the dose.
Dizziness or lightheadedness — often related to lower blood pressure or a slower heart rate.
Slow heartbeat (bradycardia) — metoprolol intentionally slows the heart, but an excessively low heart rate can be problematic.
Low blood pressure — can cause weakness, dizziness, or fainting.
Cold hands and feet — reduced peripheral circulation can cause this sensation.
Headache — can occur, particularly early in treatment.
Nausea or digestive discomfort — stomach-related symptoms are possible.
Sleep disturbances or vivid dreams — some people report insomnia or nightmares.
Shortness of breath or wheezing — uncommon, but more concerning in people with asthma or other breathing problems.
Sexual difficulties or mood changes — these have been reported, although they aren’t among the most common effects and can have other causes.
One particularly important issue
Metoprolol can mask some symptoms of low blood sugar, especially the rapid heartbeat that normally warns someone they’re becoming hypoglycemic. This is particularly relevant if you use insulin or other diabetes medicines.
When to seek medical help
Contact a healthcare professional promptly for fainting, severe dizziness, worsening shortness of breath, wheezing, swelling, chest pain, or an unusually slow heartbeat.
And don’t suddenly stop metoprolol without medical advice. Abruptly stopping a beta-blocker can cause a rebound increase in heart rate and blood pressure and may worsen certain heart conditions.
Bottom line: Metoprolol can cause side effects, but it is an established and useful medication for conditions including high blood pressure, angina, certain abnormal heart rhythms, and heart failure. Whether a symptom is actually caused by metoprolol depends on the dose, formulation, other medicines, and your underlying condition.
