1. Unusual tiredness or weakness
Metoprolol slows your heart rate and reduces blood pressure, which eases strain on your heart but also decreases the body’s overall energy output. This often leads to feelings of unusual tiredness or muscle weakness, particularly during the first few weeks of treatment. You might notice that tasks like climbing stairs or even routine activities require more effort than before.
This fatigue happens because your heart is pumping more efficiently but less forcefully, so your muscles receive less immediate oxygen-rich blood. Over time, many people adapt as their bodies adjust to the medication.
To manage this symptom, avoid sudden increases in physical activity and try gentle exercise like short walks to gradually build stamina. If the tiredness is severe, persistent, or worsening, discuss it with your healthcare provider to rule out other causes or consider dose adjustments.
2. Dizziness or lightheadedness
Dizziness, especially when standing up quickly (orthostatic hypotension), is common with metoprolol use. This occurs because the drug lowers blood pressure by relaxing blood vessels and reducing heart rate, sometimes causing insufficient blood flow to the brain during position changes.
Symptoms may include feeling faint, unsteady, or experiencing a head rush. These usually improve as your body adjusts but can increase your risk of falls, particularly in older adults.
- Rise slowly from sitting or lying down positions.
- Stay hydrated to maintain blood volume.
- Avoid alcohol or other blood pressure-lowering substances.
If dizziness is severe, happens frequently, or is accompanied by fainting, consult your prescriber promptly as these may signal excessive blood pressure lowering or other cardiac concerns.
