What are the side effects of Sanfu贴 (Sanfu patches)?

Side effects of Sanfu patches may include skin allergies, itching, redness, swelling, blistering, and possible skin damage. Some patients may also experience adverse reactions such as contact dermatitis. In addition, prolonged use may lead to an imbalance of yin and yang in the body, internal heat ("fire"), or menstrual disturbances. Therefore, before using Sanfu patches, ensure that you are not allergic to any of the ingredients, and follow the correct application methods and duration. If severe discomfort occurs, discontinue use immediately and seek medical attention.