Do you find yourself easily irritated when you take modafinil? Does it feel as though your patience for people has reached an all-time low? You’re not alone. While modafinil is an excellent productivity enhancing drug, irritability can be an undesirable side-effect— especially when you’re at work or school and need to interact with people throughout the day. Here’s why modafinil can make you feel irritable, and how to manage it effectively.