Common myths about NyQuil include the belief that it is entirely safe for long-term use and that higher doses are more effective In reality NyQuil is intended for short-term relief of cold and flu symptoms and prolonged use can lead to dependency and side effects Taking more than the recommended dose does not enhance its effectiveness and can increase the risk of adverse effects such as liver damage and severe drowsiness It’s important to use NyQuil as directed and to be aware of its limitations and potential risks