What happens when someone without ADHD takes ADHD medicine?

A complex question. The simple answer is: It depends on the stimulant dosage and the individual taking it.

Depending on the dosage and the individual, some people who do not have ADHD might react to a stimulant the way they would to a strong cup of coffee. They might feel energized, anxious, and/or irritable.

Contrary to online mythology, neurostimulants are not “smart drugs.” And it’s not smart to abuse them.

Humans have for centuries (and probably longer) consumed stimulants of various types, including tea and coffee. So there is a baseline of positive response with these substances in some people who don’t even have ADHD.

We cannot exactly compare caffeine and neurostimulant medication, though. There is a similar but not exact mechanism of action.

Remember: ADHD is a “dimensional” diagnosis. That is, the symptoms are all human traits. It’s their severity and number, in the presence of impairment, that makes the diagnosis.

Bottom line: A low dose of a stimulant might help some people who don’t have ADHD or who maybe have a sub-threshhold case — that is, almost but don’t quite qualify for the diagnosis. But if more stimulant ingested that might be found in, say, a cup or two of coffee, the risk is more side effects than benefits. Especially in people who have anxiety.

The exact same thing as someone with ADHD. The only difference is the tolerance that an ADHD person has developed to the drug.

If a person with ADHD that has never taken stimulant medications took say a 30mg aderall, they would get just as high as a person without ADHD. It is a complete fallacy that stimulants have the opposite effect on people with ADHD.

It is a FACT that people with ADHD will have the same raised blood pressure, higher heart rate, dilated pupils, and stimulating effect that everybody gets.

At low doses like 5mg Dexedrine or 10 mg Ritalin the stimulants usually will exert a calming effect on those who don’t technically have ADHD, while large doses of stimulants taken quickly under certain situations can usually make someone with ADHD more hyperactive. There is an inverted “U” shaped curve of efficacy versus dosage but the peak for people without ADHD is usually pretty low compared to the peak for those without.

Things get more complicated when pharmacokinetics (PK) and pharmacokinetic-pharmacodynamic (PK-PD) interactions are taken into account as stimulant effect is particularly influenced by the rate of onset. Faster onset leads to more euphoria, slower to more control on ADHD symptoms. Meanwhile the drugs show tachyphylaxis, tolerance that develops over the course of a day and resets overnight.

Of course, these drugs can be used therapeutically for other indications besides ADHD such as narcolepsy where they act to promote wakefulness and off-label for impulsivity after brain damage which clinically resembles ADHD.

BUT—for people who do not have ADHD, stimulants flood the brain with dopamine, causing a dopamine overload. So instead of having a calming effect as they would on people with ADHD, stimulants taken without a medical reason can disrupt brain communication and cause euphoria. Some studies have found that caffeine can boost concentration for people with ADHD. Since it's a stimulant drug, it mimics some of the effects of stronger stimulants used to treat ADHD, such as amphetamine medications. However, caffeine alone is less effective than prescription medications.

I asked my pharmacist one day, “Why is Adderall so highly regulated? It's not like you get high off of it”.

His response was, “You don't get high off of it because you need it. If you didn't need it, you would.”