Hello, Revital is a healthy diet supplement that provides energy and fights throughout the day fatigue. You have to use it in the morning. like all the medications and revital has side effects like: Convulsions (seizures)dizziness.fast heartbeat.high blood pressure.irritability.muscle twitching.restlessness.swelling of feet or lower legs. I think you have to maintain a healthy lifestyle sleeping 8 hours, healthy diet exercising and if you feel again tired make an appointment with your doctor. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Blerina Pasho, General & Family Physician