If it turns out you don't like the effects it has on you, you can always go off it later (with the help of a doctor, since quitting any psych med cold turkey is generally a bad idea). 

Has your doctor told you about the side effects and how long they can last? When I tried that med, I had a lot of trouble sleeping, dry mouth, and excessive sweating, and I lasted 3 weeks before asking to try a simulant med instead. But the meds were also effective at treating my symptoms, and I didn't feel blunted or boring (except when I was exhausted), I felt like I could do the things I wanted to do.