Drinking too much coconut water can have negative health effects. Excessive intake may cause hyperkalemia (dangerously high potassium levels), electrolyte imbalance, low blood pressure, digestive issues like bloating and diarrhea, frequent urination, and increased stress on the kidneys. It can also interfere with certain medications, especially those related to blood pressure and potassium regulation. People with kidney problems, low blood pressure, diabetes, or allergies should be particularly cautious. Generally, it is recommended not to consume more than 1-2 cups (about two coconuts worth) per day to avoid these risks.