This question has also been asked and answered here: Concerta vs Adderall: What's the difference between them?
Ritalin, or methylphenidate, and Adderall, amphetamine salts, are completely differnent medications. Stronger than what? There is no way to dertermine which is stronger. If you have ADHD or ADD, patients are tried on many medications to try to help the symptoms of their disease.
Is there is an illegal and illicit market for these medication, there most certainly is. And unless you are taking medications prescribed for you and are found to be taking narcotics or othe controlled substance without a doctors prescription, this is a FELONY in the USA with prison time to be served.
If this was an innocent, knowledge only question, can't compare the two medications.
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