Metoprolol: The Straight Talk on 10 Side Effects & When to Get Your Doctor’s Attention, ASAP!

Metoprolol is a commonly prescribed beta blocker used to treat high blood pressure, chest pain (angina), heart failure, and certain abnormal heart rhythms. For most people, it’s effective and well tolerated, but it can cause side effects—especially when starting treatment or after a dose increase.

Here’s what you should know.

1. Fatigue or Low Energy

Feeling unusually tired is one of the most common side effects. Because metoprolol slows the heart rate, some people notice reduced energy during the first few weeks.

What you can do: Rest when needed and talk to your healthcare provider if fatigue is severe or doesn’t improve.

2. Dizziness or Lightheadedness

Metoprolol can lower blood pressure, which may make you feel dizzy—particularly when standing up quickly.

What you can do: Rise slowly from sitting or lying down and stay well hydrated unless you’ve been advised to limit fluids.

3. Slow Heart Rate (Bradycardia)

A slower heart rate is an expected effect, but if it becomes too slow, it can cause weakness, dizziness, or fainting.

Contact your healthcare provider if your pulse is unusually slow and you’re experiencing symptoms.

4. Low Blood Pressure

Symptoms may include:

Blurred vision
Weakness
Feeling faint
Confusion
Dizziness

Persistent or severe symptoms should be evaluated by your healthcare provider.

5. Cold Hands and Feet

Reduced blood flow to the extremities may leave your fingers and toes feeling cold.

Keeping warm and staying active may help.

6. Shortness of Breath or Wheezing

Although metoprolol is relatively selective for the heart, it may still affect breathing in some people, particularly those with asthma or chronic lung disease.

Seek medical advice promptly if you develop new or worsening breathing problems.