Drinking guava leaf tea can offer numerous health benefits, but overconsumption may lead to unwanted side effects. When taken in large amounts, guava leaves—rich in tannins—can irritate the digestive system. Common symptoms may include constipation, nausea, bloating, or abdominal discomfort, especially in people with sensitive stomachs or pre-existing digestive issues.

Excessive intake may also place stress on the liver and kidneys, as these organs process the bioactive compounds in guava leaves. For those with underlying liver or kidney conditions, consuming too much tea might contribute to fatigue or reduced detoxification efficiency over time.

One of guava leaf tea’s known benefits is its ability to regulate blood sugar. However, drinking too much can cause blood sugar to drop too low, particularly in people using insulin or medications for diabetes. Symptoms of low blood sugar include shakiness, dizziness, sweating, and, in more severe cases, fainting — highlighting the need for moderation.

Guava leaf tea can also interact with certain medications, including those for diabetes, high blood pressure, and blood thinning. These interactions might either enhance or reduce a drug’s effectiveness, potentially leading to health complications. People on regular medication should consult a healthcare provider before incorporating the tea regularly into their routine.

Despite these cautions, guava leaf tea offers many benefits when consumed responsibly. It supports digestive health, relieves indigestion, and promotes a balanced gut microbiome. Its anti-inflammatory and antioxidant properties help strengthen the immune system and may ease joint pain or inflammation.

For safe use, the recommended dosage is 1–2 cups per day, not exceeding 3 cups. Ideal times to drink are in the morning or afternoon. Pregnant or breastfeeding individuals, or those with chronic health conditions, should seek medical advice. Used mindfully, guava leaf tea can be a valuable addition to a healthy lifestyle.