What are the side effects of Ketotifen tablets?

Jun 24, 2025 Source: Cainiu Health

Dr. Yang Ziqi

Introduction

Under normal circumstances, the side effects of Ketotifen tablets include drowsiness and dizziness, gastrointestinal discomfort, arrhythmia, skin reactions, difficulty concentrating, and others. If any discomfort occurs, prompt medical attention is recommended. Ketotifen tablets have antihistamine properties, but they may also cross the blood-brain barrier and affect the central nervous system, leading to symptoms such as drowsiness and dizziness in users.

Generally, the side effects of Ketotifen tablets include drowsiness and dizziness, gastrointestinal discomfort, arrhythmia, skin reactions, and difficulty concentrating. If any discomfort occurs, prompt medical attention is recommended. A detailed analysis is as follows:

1. Drowsiness and Dizziness: Ketotifen tablets have an antihistamine effect but may also cross the blood-brain barrier, affecting the central nervous system and causing symptoms such as drowsiness and dizziness in users.

2. Gastrointestinal Discomfort: This includes nausea, vomiting, diarrhea, or constipation. These side effects may result from Ketotifen's impact on gastrointestinal smooth muscles or the irritant effects of its metabolites on the gastrointestinal tract.

3. Arrhythmia: In rare cases, Ketotifen may cause irregular heartbeats. This may be related to its potential cardiotoxicity. Extra caution is required when administering Ketotifen to patients with poor cardiac health.

4. Skin Reactions: Some patients may develop skin reactions such as rashes and itching, which represent allergic responses to Ketotifen. The skin is one of the largest immune organs in the body, and when the body identifies Ketotifen as a foreign substance, it may trigger an immune response leading to skin symptoms.

5. Difficulty Concentrating: Ketotifen tablets may affect a patient's ability to concentrate; therefore, it is not recommended to engage in tasks requiring high levels of attention, such as driving or working at heights, during treatment.

If any discomfort occurs during use, administration should be stopped immediately and a doctor should be consulted.

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