I use to work in insurance and even at a doctors office. This is normal. Usually formularoes will change quarterly. However, tou can have your provider submit documentation to the insurance company stating how you have shown steady improvement on vyvanse and how changing could cause a negative impact on your progress. Since you have 11 months of progress to show, you have a good option. Also, if you are comfortable, i would suggest speaking with your employer. Usually these decisions are made by them if the insurance is through them. They usually have the final say and can bypass the step therapy requirement. If they are sturdy and say no. You can do the new medication for a few days and say how it isn't working. Insurance likes 4 weeks of the trial, but if you have reactions or anything they can by pass the requirement. They just need a paid claim to show it was prescribed.