What is the most significant side effect of finasteride?

Finasteride is commonly available in tablet and capsule forms. In general, long-term excessive use of finasteride may lead to side effects such as allergic reactions, fluid and sodium retention, gastrointestinal reactions, anemia, and emotional or psychological changes. It is recommended to use this medication appropriately under a doctor's guidance. A detailed explanation is as follows:

1. Allergic Reactions

Some patients may experience allergic reactions to finasteride, presenting symptoms such as itching, rashes, and swelling of the lips, tongue, and face.

2. Fluid and Sodium Retention

Finasteride use may cause fluid and sodium retention, leading to temporary edema. This may be due to the drug's impact on the body's water and salt balance mechanism. Edema typically occurs in the lower limbs and face.

3. Gastrointestinal Reactions

The medication may irritate the gastrointestinal tract, increasing digestive burden. Some patients may experience gastrointestinal discomfort symptoms such as nausea, vomiting, bloating, and abdominal pain after taking finasteride.

4. Anemia

Finasteride may lower androgen levels, and androgens play a role in promoting bone marrow hematopoiesis. Long-term use of finasteride may lead to anemia, with symptoms such as fatigue, weakness, and dizziness.

5. Emotional and Psychological Changes

Long-term high-dose use of finasteride may cause some patients to experience emotional changes such as low mood and depression, and may even induce schizophrenia.

During medication, patients should closely monitor their emotional changes and seek medical attention promptly if abnormalities occur to avoid unnecessary physical harm. Maintaining healthy lifestyle habits, such as eating a light diet, maintaining regular作息 (作息 should be replaced with appropriate English term like "sleep patterns" or "routine"), and getting adequate rest, can help reduce drug side effects and maintain overall health.