I read the title and thought about some of the side effects and that’s valid (irritability, tiredness when it wears off, sexual dysfunction). But your comments show she doesn’t understand that it’s not a willpower thing, it’s a chemicals in your brain thing and no amount of willpower will change that - and in fact that kind of talk is actively harmful. There’s absolutely a lot that can be done with mindset etc. but the drugs are a tool that enables the coping strategies and mindset work! Otherwise it’s doomed to frustration and failure.
With that in mind - to be blunt - she needs to learn more about ADHD in order for the relationship to be healthy.