Hello, Your friend is very lucky to have diluted the mosquito repellent in 1 liter of water. You mentioned it was only 2 drops. So you don t need to worry as its potency gets decreased when diluted with large amounts of water. The repellent would no longer be active. Symptoms of swallowing sprays that contain pyrethrins are breathing difficulty, coughing, loss of alertness (stupor), from the blood oxygen level being out of balance, tremors (if a large amount is swallowed), seizures (if a large amount is swallowed), upset stomach, including cramps, stomach pain, and nausea and vomiting. Below are symptoms of using sprays that contain DEET in different parts of the body like eyes, ears, nose, and throat. Temporary burning and redness, if DEET is sprayed into these parts of the body. Washing the area will usually make the symptoms go away. Burns to the eye may require medicine. It affects the heart and blood (if a large amount is swallowed). Low blood pressure and very slow heartbeat Affects the nervous system Clumsiness when walking Coma (lack of responsiveness) Disorientation Insomnia and mood changes If any of the above mentioned symptoms appear, you need to take her to emergency. In my opinion, the dosage that your friend consumed is too low and diluted to show any effect. Hence, you can relax, nothing is going to happen as it s already 24 hours without symptoms. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pallavi M., Anesthesiologist