I’m glad that you told me about this! I set off to see where the generic Vyvanse is manufactured and it’s one that’s in the US, however, I also found out that it’s not my imagination that the generic isn’t working as the original Vyvanse did. Insurance companies, of course, push you over to the generic, but, as in the case of this medicine, many people report that the generic is not as effective as the name brand. I found this site -
MedWatch Online Voluntary Reporting Form. where you can provide data if the generic drug you’re taking isn’t as effective as the original and how to get your doctor to help so that you can get the right medication despite what the insurance company wants. They (insurance) wields way too much power in your treatment plans
Once you or your doctor has filed a report, you can try to see if you can convince your insurance company to cover the brand-name drug for you. Dr. Sultan says, “you can plead with the insurance company for why you need a brand medication, … but the insurance company, of course, makes it an administrative chore for the patient and us [doctors].”
Here’s the site I found where you can check to see if the generic versions of any medicines you take have issues:
Investigating Generics Archives - MedShadow Foundation
There’s a lot of other useful information there about recalls in meds and FDA info about a number of issues with meds.
And at the crux of insurance companies having so much power, I started digging into the “ACÁ.” “
Oh what a tangled web we weave/ When first we practice to deceive,“ - Sir Walter Scott. The deception coming from the author of the ACÁ - Obama. 
And that’s where I’ll stop - “if you can’t say something nice, then don’t say nothing at all!”
For a long time, the military and VA made certain name-brand thyroid and heart medications were available and that docs could specify them when prescribing. However, alas . . .
I've definitely found HUGE differences between name-brand and generic thyroid medications.
Fortunately, if the only issue is effectiveness, the dose can be adjusted for the needed effect.
Unfortunately, in some cases, the "inert" ingredients have caused problems. Lucky for me, that created a medical necessity for name-brand Synthroid (T4) instead of generic Levothyroxine (T4), while I was in the military and later, from the VA. Note, when I first got here, another a wonderful woman Endocrinologist, who retired at the beginning of covid, switched me to dual therapy Synthroid (T4) / Cytomel (T3), which was absolutely life-changing).
Now, the VA here has quit Synthroid due to cost). Since the issue with the generic Levothyroxine (T4) still exists, and would be even worse with the VA's new selected generic T4, the Endocrinologist kindly prescribed the generic of a new, very different product (generic Tirosint, aka Levothyroxine capsules) (T4), which is clean, simple, and exceptionally smooth
The only issue with the new T4 is that my dose was reduced because the VA doesn't have all the strengths the manufacturer makes to closely approximate my previous Synthroid (T4) dose

Additionally, either the new medication is at the bottom of the range allowed for a narrow-therapeutic range medication, and/or my body is absorbing and using it faster/better, so I need more of it to last until next thyroid dose. Unfortunately, the VA doesn't have the smallest size dose available from the manufacturer to increase the dose a little bit, and too much T4 causes afib problems, so stuck at an inadequate dose for the generic Tirosint (T4). Fortunately, the difference can be made up with more Cytomel (T3), which doesn't cause afib issues and is actually a better ratio for me in many ways (not just thyroid-wise)
Unfortunately, any dosing with Cytomel (T3) causes TSH to be suppressed and lab results that my doc doesn't interpret properly because he's a T4 monotherapy proponent and tries to go by TSH results
It's been a giant pain in the neck for 37+ years, but God has surely watched over me through this whole thyroid mess, all the way back to 1988, when I was first diagnosed with thyroid cancer
FWIW, I've been issued two different generic Cytomel (T3) (aka Liothyronine). One was very rough and inferior, and the other was actually smoother and a little better than the name-brand Cytomel (T3).
Over-the-counter (OTC) medications also exhbit the same differences between name-brand and generic/store brand. Diferent "inert" ingredients, colors, sweeteners, etc., etc., etc.
Name-brand Abreva definitely works far better than generic/store brand. The tube works better than the pump, as well.
Equate (WalMart) and Walgreen's generic acetaminophen work as well as name-brand Tylenol, but other generics I've tried don't (for fever). The generics actually work better for some headaches and other pain than name-brand Tylenol (comparing caplets to caplets). IDK about capsules.
Generic diphenhydramine contains blue dye #1, to which I'm allergic, but at least one form (UltraTabs) of the name-brand Benadryl doesn't.
Walgreen's generic Levocetirizine works as well as name-brand Xyzal.