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Metoprolol & Potassium Chloride

author image Maria Warren, R.N.
A registered nurse, Maria Warren has worked as a professional health writer since 2006. She holds a Bachelor of Science in nursing from Salem State College and a Master of Public Health in nutrition from Tufts University. Warren is currently working toward a nurse practitioner license.
Metoprolol & Potassium Chloride
High potassium levels may cause an irregular heartbeat. Photo Credit johnaaron81/iStock/Getty Images

Metoprolol, which is sold under the brand name Lopressor, is in a group of drugs called beta-blockers. Metroprolol is mainly prescribed to treat high blood pressure and angina, according to Drugs.com. Metoprolol may increase potassium levels in the body, according to Drugs.com. Taking metoprolol with potassium chloride may cause further increase in potassium levels in your blood.

Drug Interaction

Potassium chloride is a drug usually prescribed to patients with low potassium levels in their bodies. Potassium is an important mineral that helps the muscles of your heart function properly. Potassium chloride is usually taken under the close supervision of a trained health care professional because high levels of potassium in the blood can trigger cardiac arrest. Potassium chloride may interact with many drugs. Inform your doctor about all prescription and OTC medications you are taking before potassium chloride is prescribed. If your doctor prescribes metoprolol at the same time with potassium chloride, he will most likely order frequent blood tests to monitor potassium levels in your blood. Make sure you attend all your appointments to have your blood work examined.

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If your are taking metoprolol and potassium chloride be aware of the signs and symptoms of hyperkalemia, an abnormally high potassium level, so that you can seek immediate medical attention. Early symptoms of hyperkalemia include irregular heartbeat, a slow, weak or absent pulse, nausea and vomiting, according to PubMed Health. Stop taking potassium chloride and metoprolol and seek immediate medical attention if you notice any of these symptoms.


Metoprolol is available in form of regular tablets and extended-release tablets that are taken orally. The regular tablets are usually taken once or twice a day with meals or immediately after meals. The extended-release tablet is usually taken once a day. Swallow the tablet whole, without crushing or chewing. Take Metropolol one to two hours before taking potassium chloride to lessen drug interaction.


Your doctor may advise you to avoid or limit eating potassium-rich foods when you are taking potassium chloride and other drugs that increase levels of potassium in the blood. Examples of potassium-rich foods include oranges, bananas, prunes, kiwi, tomatoes, carrots, dried figs,avocados, molasses and spinach. Do not stop eating potassium-rich foods without first consulting your doctor.

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