Cocaine is still used in the medical industry, as are derivatives/analogs of methamphetamine such as Dexmethylphenidate or Lisdexamfetamine. Just because something is in the name of of it chemically speaking doesn't mean it has the same properties, or similar effects, or is in anyway included as an 'add-on'.

You are confusing 3,4-Methylenedioxymethamphetamine (C₁₁H₁₅NO₂) with Methamphetamine (C10H15N). Chemically speaking they are comparative but completely different. An orange and an apple are both fruits but they are most definitely NOT the same thing when it comes to dietary impact, fiber, Vitamin C levels, etc.

Your also taking a negative ideology on drug use based on previous experience or teachings and applying it to something you were told was bad and should stay away from. I was told I was perfectly fine just the way I was, turns out that was wrong and parents/teachers didnt want to apply a label to student or child out of fear. As an adult 10 years later I am now prescribed medication similar to MDMA to help my condition, within 4 years Ive tripled my base by while graduating college creating and entirely new life for myself, finding love, getting married, all of this because I'm no longer a shut in with alot of potential but the lack of focus to apply it.

Remove stigmatism, apply science, reduce harm, help others.