What is 40 mg of vyvanse equal to in adderall?

There's no direct, universally agreed-upon conversion between Vyvanse (lisdexamfetamine dimesylate) and Adderall (amphetamine/dextroamphetamine). This is because:

• Different mechanisms: Vyvanse is a prodrug; it needs to be metabolized by the body to become active dextroamphetamine. Adderall is a direct-acting mixture of amphetamine salts. This means the conversion isn't a simple 1:1 ratio.
• Individual variation: How quickly and efficiently someone metabolizes Vyvanse varies significantly from person to person, affecting the actual amount of dextroamphetamine produced.

Therefore, there's no accurate equivalent dose. A doctor would need to carefully consider an individual's response to medication to determine an appropriate equivalent dose of Adderall if switching from Vyvanse (or vice versa). Simply trying to calculate a conversion based on milligrams can be dangerous and ineffective.

Attempting a self-conversion is strongly discouraged. Always consult a physician or psychiatrist for any medication changes, including switching between ADHD medications. They can assess your individual needs and prescribe the safest and most effective dose.