I tried Vyvanse 20 mg for one day and while it seemed to give me more energy, I didn't feel like it improved my focus. Here are the pros and cons:
Pros:
Cons:
Heart rate increase, heart felt like it was beating out of my chest
Increased anxiety
Cold feet and hands, poor blood circulation
Felt tense, like I was on edge
Overall, considering the side effects I don't think it was very helpful for me. Modafinil gives me the same benefits without the side effects.