Metoprolol: 7 things to know | Medications Explained

Metoprolol is a beta blocker. It slows the heart rate, lowers blood pressure and reduces how hard the heart has to work.

Succinate vs tartrate

Succinate (extended-release): taken once daily, in most cases, and designed to release more steadily over about 24 hours.
Tartrate (immediate-release): usually taken once or twice daily.
They are two forms of the same drug and are not interchangeable on your own. Do not swap forms, and do not stop metoprolol suddenly without talking to your clinician first.

7 things to know

1Don't stop it suddenly

Better numbers may mean the medicine is working. Stopping a beta blocker abruptly can worsen chest pain and, in people with coronary artery disease, lead to serious heart problems. Side effects or doubts are a reason to review it with your prescriber, not to stop.

2Know which form you take

Tartrate is usually taken more than once a day; succinate extended-release is usually once a day. They are not interchangeable. Extended-release tablets should not be chewed or crushed.

3Watch for too much effect, not just good numbers

Slower heart rate and lower blood pressure are the goal, but too much effect can cause fatigue, dizziness or light-headedness. Tell your pharmacist or prescriber if you feel unwell, even if your numbers look good.

4Exercise may feel different

Metoprolol limits how quickly the heart responds to adrenaline, so your pulse may not climb the way it used to. Standard heart rate formulas may not fit, so ask your clinician about personal exercise targets.

5Every new medicine needs an interaction check

Some medicines can add to metoprolol's effect and make the heart rate too slow or blood pressure too low. Others can raise metoprolol levels. Ask your pharmacist to review anything new, including over-the-counter medicines and supplements.

6It can hide low blood sugar warning signs

Beta blockers can blunt the racing heartbeat that often signals low blood sugar. That does not mean metoprolol causes low blood sugar, but if you also take insulin or another medicine that can cause low blood sugar, talk with your care team about how to watch for it.

7Know which symptoms not to ignore

Fainting, trouble breathing, new or worsening swelling in the legs or feet, sudden weight gain, or a fast, pounding or irregular heartbeat need prompt medical attention.

8Pharmacist money check

Insurance should cover it at a generic co-pay, or using a discount card often brings the cost down drastically. Getting a 90-day supply will usually save you money in the long run, too.