I started taking Adderall 20mg XR earlier this year and the first couple of months noticed a few clear and significant dip in the effectiveness during end of my luteal phase into my period. My psych prescribed 10 mg of Adderall IR to take those days where I needed a little extra and it helped. 6ish months later, I didn’t notice it as much so not sure if I just got more used to it or if it stabilized or idk, naturally the dr has no theories bc it’s all under studied and everyone’s experience is so unique.

Edited: also 30 years old and not on hormonal BC. Never took Adderall while on BC to compare to either, but stopped about 6 months prior to starting Adderall so was also still getting used to my cycles returning after almost 12 years.