Combining modafinil with armodafinil is generally not recommended. Because armodafinil is essentially the more active, longer-lasting form of modafinil, combining the two can increase the risk of side effects such as anxiety, insomnia, headaches, elevated heart rate, and overstimulation without offering any benefits. Although these combinations are described on several websites, such as smartfinil.net, they are not secure. Since both are prescription medications, only a licensed medical practitioner should prescribe them together. Self-experimentation might lead to unnecessary risks and poor sleep habits.