Long-term Adderall use?

[my-cat-is-adhd]

Just started Adderall XR 10mg once a day (I sometimes do it twice a day because it wears off after 7-10 hours). While this drug is obviously amazing for the short-term, I question the wisdom in taking it at all. Won't I become dependent on the positive affects of this medication after a few months and become deeply saddened when I want to stop? I mean, at what point do we stop taking it? Is Adderall designed to be taken for life? I really don't understand why a doctor would prescribe this unless they intended it to be a long-term medication. Yet it is so effective at the same time. So to summarize:

1. Is Adderall intended to be a long-term drug? If so, up to how long can people take it for?
2. Will the effects of the drug eventually weaken to where I have to take higher dosages? And if so, at what point do we just stop upping the dose?
3. Will this drug likely have long-term negative effects on either my mental or physical health?
4. My libido has shot up like mad on this medication. Why doesn't the literature talk about this more. Is this a rare side effect or something?


Thanks.