Side Effects of Metoprolol Succinate

There are a number of possible side effects of metoprolol succinate, including a slow heart rate, diarrhea, tiredness, and dizziness. Some rare side effects of metoprolol succinate (documented in less than 1 percent of people taking the medicine) include insomnia, headaches, and low blood sugar. Although most metoprolol succinate side effects are minor, there are some side effects that require immediate medical attention, such as chest pain, confusion, and unexplained swelling or weight gain.

Side Effects of Metoprolol Succinate: An Overview

As with any medicine, there are possible side effects with metoprolol succinate (Toprol-XL®). However, not everyone who takes metoprolol succinate will experience side effects. In fact, most people tolerate the medicine well. When people do develop metoprolol succinate side effects, in many cases they are minor, meaning they require no treatment or are easily treated by you or a healthcare provider. Serious side effects are a lot less common but can still occur.
(This article covers many, but not all, of the possible side effects with metoprolol succinate. Your healthcare provider can discuss a more complete list of metoprolol succinate side effects with you.)

Metoprolol Succinate Side Effects to Report

There are a number of side effects with metoprolol succinate that you should report immediately to your healthcare provider. These serious side effects include but are not limited to:
  • Unexplained swelling or sudden weight gain (see Toprol and Weight Gain)
  • Chest pain
  • Dizziness, lightheadedness, or fainting spells
  • Confusion
  • An irregular heartbeat (arrhythmia)
  • Signs of an allergic reaction, including unexplained rash, hives, itching, unexplained swelling, wheezing, or difficulty breathing or swallowing.
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Metoprolol Succinate (Toprol-XL)

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