The side effects of phenolphthalein tablets mainly include the following two aspects: 1. Short-term use of phenolphthalein tablets can cause rash, but also allergic reactions, enteritis, dermatitis and bleeding tendency; 2. Long-term use of phenolphthalein tablets can lead to loss of nutrients, which can cause complications such as anemia, water-electrolyte balance disorder, low weight, decreased resistance and malnutrition. For young women, long-term use of phenolphthalein tablets can cause endocrine dysfunction, affecting their reproductive function and leading to infertility. Long-term use of phenolphthalein tablets can also cause irritation to the mucous membrane of the gastrointestinal tract, resulting in gastritis, enteritis, gastric ulcer, intestinal mucous membrane erosion and other related symptoms. Phenolphthalein tablets are a stimulating laxative that promotes defecation by stimulating the colonic mucosa to enhance its peristalsis and the absorption of fluid in the toe intestine. It is mainly used for habitual constipation, but should not be used for a long time.