Mulberry leaf tea is a traditional Chinese herbal tea, which is usually used for clearing away heat and toxic materials, moistening lung and relieving cough. Its efficacy and side effects are often related to drinking quantity, quality and personal health. Here are some possible side effects:

1. Gastrointestinal discomfort: Mulberry leaves contain plant fiber, oxalic acid and other ingredients. Excessive drinking will cause irritation to the gastrointestinal tract, causing discomfort such as bloating, nausea and diarrhea.

2. Drug interaction: Mulberry leaf tea contains some chemical components, which may interact with some drugs, resulting in reduced efficacy or increased drug side effects.

3. Allergic reaction: People who are allergic to mulberry leaves may have allergic reactions such as itchy skin and difficulty breathing, especially if they drink a lot or drink for a long time.

4. Long-term drinking affects iron absorption: Mulberry leaf tea contains some antioxidants and oxalic acid, which may affect the absorption and utilization of iron by human body.

Generally speaking, mulberry leaf tea has many medicinal effects, but it still needs to be drunk in moderation according to personal conditions. It is strongly recommended to consult a doctor or Chinese medicine practitioner.