Taking two doses of Clonafit Plus once by mistake is usually not dangerous in a healthy adult, but it can cause increased sleepiness, dizziness, poor coordination, or slowed breathing. Rest, avoid driving or alcohol, and monitor for symptoms like extreme drowsiness, confusion, or breathing difficulty?if any of these occur, seek medical help immediately. Do not repeat the extra dose, and continue your normal dose as prescribed; if unsure, contact your doctor.