Methamphetamine has one narrow, legal medical use: treating attention deficit hyperactivity disorder (ADHD) in children six and older. It is FDA-approved and sold under the brand name Desoxyn, though it is rarely prescribed because safer alternatives exist. Outside of that, methamphetamine is overwhelmingly used illicitly as a powerful stimulant, and its health consequences are severe.
The Prescription Form: Desoxyn
Methamphetamine hydrochloride, marketed as Desoxyn, is a Schedule II controlled substance. That classification means the federal government recognizes it has a legitimate medical application but also a high potential for abuse and severe dependence. In practice, Desoxyn occupies a tiny corner of ADHD treatment. Doctors almost always reach for other stimulant medications first, reserving Desoxyn for cases where those options have failed.
The prescribed doses are far lower than what recreational users consume. A typical treatment starts at 5 mg once or twice daily and may be increased in small increments each week, with the target range landing between 20 and 25 mg per day. At these doses, the drug helps increase focus and reduce impulsive behavior by boosting dopamine activity in the brain. Desoxyn was also historically approved for short-term weight loss, though that use has largely fallen out of favor.
How Methamphetamine Works in the Brain
Methamphetamine floods the brain with dopamine, the chemical messenger tied to motivation, pleasure, and reward. It does this in two ways: it blocks the recycling of dopamine back into nerve cells, and it actually reverses the transporters so they pump dopamine outward into the gaps between neurons. The result is a massive surge of dopamine that far exceeds what the brain produces naturally.
This is what makes the drug both effective for ADHD at low doses and dangerously addictive at higher ones. Over time, the brain adapts to the excess dopamine by reducing the number of dopamine receptors and transporters available. Brain imaging studies show a significant loss of dopamine transporters in people who use methamphetamine heavily. Some recovery occurs after prolonged abstinence, but the process is slow and often incomplete.
Why People Use It Illicitly
Most methamphetamine use has nothing to do with a prescription. People use illicit meth for its intense euphoria, heightened energy, and suppressed appetite. A single dose can keep someone awake and active for hours or even days. During World War II, methamphetamine (sold as Pervitin) was given to German soldiers and Japanese pilots specifically for endurance and alertness, though it also caused severe agitation and aggression.
That wartime pattern hints at why people still turn to the drug today. It creates an artificial sense of confidence, productivity, and well-being that can feel useful in the short term, especially for people working long hours, managing depression, or trying to lose weight. But these effects come at a steep biological cost, and the cycle of use quickly becomes compulsive.
Cardiovascular Damage
Methamphetamine is particularly destructive to the heart and blood vessels. Each dose causes a rapid spike in both heart rate and blood pressure, paired with acute constriction of blood vessels. Over time, repeated exposure reshapes cardiac tissue in dangerous ways. The heart’s left ventricle can enlarge and weaken, a condition called dilated cardiomyopathy. Biopsies of heart tissue from people with meth-related cardiomyopathy show increased inflammation and scarring (fibrosis), both of which impair the heart’s ability to pump blood effectively.
Heart attacks in methamphetamine users result from two mechanisms: sudden spasms that temporarily cut off blood flow to the heart, and accelerated buildup of arterial plaque. A large retrospective analysis of more than 35 million hospital patients found that methamphetamine users had a 27% increased risk of sudden cardiac death compared to non-users. Cardiovascular complications are now one of the leading causes of death among people who use meth regularly.
Effects on Brain Structure
Beyond dopamine depletion, chronic methamphetamine use physically alters the brain. MRI studies of long-term users reveal lower gray matter volumes alongside changes in white matter, the wiring that connects brain regions. The striatum, a deep brain structure involved in movement and reward, often enlarges abnormally. Metabolic activity shifts as well: some brain regions become overactive while others, particularly areas involved in memory and sensory processing, slow down.
There is also clear evidence of neuroinflammation. The brain’s immune cells become activated in response to methamphetamine, and this inflammatory response is detectable on specialized brain scans. Some of these changes partially reverse with sustained abstinence. Dopamine transporter levels show measurable recovery after months to years of sobriety, and metabolic activity in certain brain regions can normalize. But the degree of recovery varies widely from person to person, and some structural changes appear to persist.
Treatment for Methamphetamine Use Disorder
There is currently no FDA-approved medication specifically for methamphetamine addiction, which makes treatment fundamentally different from, say, opioid use disorder. Behavioral interventions are the first-line approach, and two stand out. Contingency management, which provides tangible rewards (often small financial incentives) for clean drug tests, has the strongest evidence of any single treatment. Cognitive behavioral therapy, which helps people identify triggers and develop coping strategies, is also effective on its own or combined with contingency management.
A comprehensive review of 44 studies found that these behavioral approaches successfully promoted abstinence, reduced use, and lowered cravings. The Matrix Model, a structured 16-week outpatient program combining group therapy, education, drug testing, and relapse prevention, has also shown treatment efficacy. Exercise programs and residential rehabilitation round out the options, though evidence for those is less robust. Recovery is possible, but it tends to be a longer road than with many other substances, partly because the brain’s dopamine system needs extended time to heal.