Ah, gotcha. Well, while you're on the waitlist it's totally fine to skip doses. A lot of doctors will suggest taking regular breaks, like skipping weekends or taking an annual drug holiday, so I can't imagine it being a problem to only take as needed. The only downside is that it has the potential to reduce your tolerance, which can make the side effects worse when you do take the meds, but it's not unsafe to try it and see how it works for you. Stimulants are only really dangerous if you take too many, or mix them with drugs that have adverse interactions. You're not harming yourself by taking fewer doses.