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Cimetidine Side Effects

cimetidine side effects

Cimetidine is a medication that belongs to a class of drugs called H2 receptor antagonists. It commonly treats conditions such as gastroesophageal reflux disease (GERD), peptic ulcer disease, and Zollinger-Ellison syndrome. While cimetidine can be an effective treatment for these conditions, it can also cause side effects that range from mild to severe.

In this article, we’ll take a closer look at some of the most common and serious side effects of cimetidine.

Common Side Effects

Gastrointestinal Effects – Cimetidine can cause a range of gastrointestinal side effects, including nausea and vomiting, diarrhea or constipation, and abdominal pain. These side effects may be more common in people taking high doses of the medication.

Central Nervous System Effects – Some people may experience headache, dizziness, or lightheadedness when taking cimetidine. In rare cases, confusion or agitation may occur.

Skin-Related Effects – Rash, itching, and hair loss are all potential side effects of cimetidine. In some cases, the medication may also cause changes in the skin color.

Rare but Serious Side Effects

Blood-Related Effects – Cimetidine can lower the number of white blood cells or platelets in some people, increasing their risk of infection or bleeding.

Liver Damage – While rare, Cimetidine can also cause liver damage in some people. Symptoms of liver damage may include abdominal pain, nausea and vomiting, and jaundice (yellowing of the skin and eyes). Certain factors, such as high doses of Cimetidine, its long-term use, and underlying liver disease, may increase the risk of liver damage.

Allergic Reactions – In rare cases, Cimetidine can cause an allergic reaction, which may be life-threatening. Symptoms of an allergic reaction may include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat.

Precautions and Warnings

If you are taking Cimetidine, it is important to follow your healthcare provider’s instructions carefully. Dosage and administration may vary depending on the condition of the person, and it’s important to take the medication exactly as directed.

Cimetidine is not recommended for everyone, and some people may be at higher risk of side effects or complications. It is important to tell your healthcare provider about your underlying health conditions and your ongoing medications, as these can affect how Cimetidine interacts with your body.

Finally, if you experience any unusual or severe side effects while taking Cimetidine, it is important to seek medical attention right away.


Cimetidine can be an effective treatment for a range of conditions, but it’s important to be aware of the potential side effects. By understanding the risks and taking precautions as directed by your healthcare provider, you can minimize the chances of side effects or complications.

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