Adderall (Amphetamine/dextroamphetamine) is highly unlikely to affect the menstrual cycle. Though there are some patient reports of interference, there are no published literature that states about the association. This would well mean that many of them as your doctor suggested in your case a random occurrence unrelated to Adderall intake. As you have been taking Adderall for 4 years, I would suggest you to keep your physician in loop on whether to stop or continue the medication. Abruptly stopping is not desirable as it can cause withdrawal symptoms or flare up the previous symptoms. Do consult your prescribing physician before taking a call on Adderall. I hope the above information helps you. Thanks for writing into healthcaremagic. Have a wonderful day.