The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) describes the following 11 amphetamine-related psychiatric disorders: 
- Amphetamine-induced anxiety disorder
- Amphetamine-induced bipolar disorder
- Amphetamine-induced depressive disorder
- Amphetamine-induced psychotic disorder
- Amphetamine-induced sexual dysfunction
- Amphetamine-induced sleep disorder
- Amphetamine intoxication
- Amphetamine intoxication delirium
- Amphetamine withdrawal
- Amphetamine-induced obsessive-compulsive and related disorder
- Unspecified stimulant-related disorder
Either prescription or illegally manufactured amphetamines can induce these disorders. Prescription amphetamines are used frequently in children and adolescents to treat attention deficit hyperactivity disorder (ADHD), and they are the most commonly prescribed medications in children. The dose of Adderall(XR) (dextroamphetamine sulfate, dextroamphetamine saccharate, amphetamine aspartate monohydrate, amphetamine sulfate) needed to produce toxicity and psychiatric symptoms in a child is as low as 2 mg. A typical dose is 2.5-40 mg/d. In adults, narcolepsy, ADHD of the adult type, and some depression can be treated with amphetamines. Although they are controlled substances, abuse is possible, especially in persons with alcoholism or substance abuse.
The substance 3,4-methylenedioxymethamphetamine (MDMA) is a popular recreational stimulant commonly referred to as ecstasy, which was manufactured legally in the 1980s.  MDMA has the desired effects of euphoria, high energy, and social disinhibition lasting 3-6 hours. The drug is often consumed in dance clubs, where users dance vigorously for long periods. The drug sometimes causes toxicity and dehydration, as well as severe hyperthermia. Several other amphetamine derivatives are para -methoxyamphetamine (PMA), 2,5-dimethoxy-4-bromo-amphetamine (DOB), methamphetamine (crystal methamphetamine, crystal meth, or "Tina"), and 3,4-methylenedioxyamphetamine (MDA). Crystal meth is the pure form of methamphetamine, and, because of its low melting point, it can be injected.
In a web-based survey of 1,006 individuals who admitted mephedrone use, which is the largest survey to-date, results showed that users consider mephedro’e's effects to compare best with those of MDMA; the appeal of mephedrone for these individuals is in its availability, low price, and reliable purity. 
Khat (Catha edulis Forsk) is the only known organically derived amphetamine. It is produced from the leaves of the Qat tree located throughout East Africa and the Arabian Peninsula. The leaves of the tree are chewed, extracting the active ingredient, cathinone, and producing the desired effects of euphoria and, unlike other amphetamines, anesthesia.
In the midwestern United States, methcathinone, the synthetic form of cathinone, has been produced illegally since 1989, after a student at the University of Michigan stole research documents and began to illegally manufacture the drug. Methcathinone is relatively easy to produce and contains the same chemicals found in over-the-counter (OTC) asthma and cold medicines, paint solvents and thinners, and drain openers (eg, Drano). Its addiction potential is similar to that of crack cocaine.
Amphetamine-related psychiatric disorders are conditions resulting from intoxication or long-term use of amphetamines or amphetamine derivatives. Such disorders can also be experienced during the withdrawal period from amphetamines. The disorders are often self-limiting after cessation, though, in some patients, psychiatric symptoms may last several weeks after discontinuation. Some individuals experience paranoia during withdrawal as well as during sustained use. Amphetamine use may elicit or be associated with the recurrence of other psychiatric disorders. People addicted to amphetamines sometimes decrease their use after experiencing paranoia and auditory and visual hallucinations. Furthermore, amphetamines can be psychologically but not physically addictive.
The symptoms of amphetamine-induced psychiatric disorders can be differentiated from those of related primary psychiatric disorders by time. If symptoms do not resolve within 2 weeks after the amphetamines are discontinued, a primary psychiatric disorder should be suspected. Depending on the severity of symptoms, symptomatic treatment can be delayed to clarify the etiology.
Amphetamine-induced psychosis (delusions and hallucinations) can be differentiated from psychotic disorders when symptoms resolve after amphetamines are discontinued. Absence of first-rank Schneiderian symptoms, including anhedonia, avolition, amotivation, and flat affect, further suggests amphetamine-induced psychosis. Symptoms of amphetamine use may be indistinguishable from those associated with the cocaine use. Amphetamines, unlike cocaine, do not cause local anesthesia and have a longer psychoactive duration.
Amphetamine-induced delirium follows a reversible course similar to other causes of delirium, and it is identified by its relationship to amphetamine intoxication. After the delirium subsides, little to no impairment is observed. Delirium is not a condition observed during amphetamine withdrawal.
Mood disorders similar to hypomania and mania can be elicited during intoxication with amphetamines. Depression can occur during withdrawal, and repeated use of amphetamines can produce antidepressant-resistant amphetamine-induced depression. Of interest, low-dose amphetamines can be used as an adjunct in the treatment of depression, especially in patients with medical compromise, lethargy, hypersomnia, low energy, or decreased attention.
Sleep disturbances appear in a fashion similar to mood disorders. During intoxication, sleep can be decreased markedly. In withdrawal, sleep often increases. A disrupted circadian rhythm can result from late or high doses of prescription amphetamines or from chronic or intermittent abuse of amphetamines. Individuals who use prescription amphetamines can easily correct their sleep disturbance by lowering the dose or taking their medication earlier in the day than they have been. Insomnia is the most common adverse effect of prescription amphetamines.
Unspecified stimulant-related disorder is a diagnosis assigned to those who have several psychiatric symptoms associated with amphetamine use but who do not meet the criteria for a specific amphetamine-related psychiatric disorder.
A 36-year-old white male who works as a real estate agent arrives at your office, depressed, disheveled, and slightly agitated. He is very guarded and reluctant to talk about his work history or relationships. After a period of time he describes how his coworkers are manipulating his clock to read 9:11, and the police drive by with their sirens on every day at 4:20. He refuses to open his mail, because he read secondary messages by rearranging letters. He admits to spending most of his time at home alone fixing his computer, sometimes all night long. His sleep cycle is reversed on the weekends, he is depressed most of the time, isolated, lost 25 lbs in the last 3 months, and has pale skin. Only when asked about the burn mark on his hand did he admit to "smoking some T." On further questioning he disclosed a 5-month period of crystal methamphetamine use.
The pathophysiology of amphetamine-related psychiatric disorders is difficult to establish, because amphetamines influence multiple neural systems. In general, chronic amphetamine abuse may cause psychiatric symptoms due to inhibition of the dopamine transporter in the striatum and nucleus accumbens. The longer the duration of use, the greater the magnitude of dopamine reduction. Methamphetamine has been suggested to induce psychosis through inhibiting the dopamine transporter, with a resultant increase in dopamine in the synaptic cleft. 
Amphetamine-induced psychosis often results after increased or large use of amphetamines, as observed in binge use or after protracted use. Prescription amphetamines induce the release of dopamine in a dose-dependent manner; low doses of amphetamines deplete large storage vesicles, and high doses deplete small storage vesicles. This increase in dopaminergic activity may be causally related to psychotic symptoms because the use of D2-blocking agents (eg, haloperidol) often ameliorates these symptoms. Amphetamine-induced psychosis has been used as a model to support the dopamine hypothesis of schizophrenia, in which overactivity of dopamine in the limbic system and striatum is associated with psychosis. However, negative symptoms commonly observed in schizophrenia are relatively rare in amphetamine psychosis.
MDMA causes the acute release of serotonin and dopamine and inhibits the reuptake of serotonin into the neuron. MDMA has neurotoxic properties in animals and, potentially, in humans. Reports suggest that MDMA use is associated with cognitive, neurologic, and behavioral abnormalities, as well as hyperthermia, but these reports are confounded by the association with other factors (eg, heat, exertion, poor diet, other drug use). Serotonergic damage has been suggested to lead to cognitive impairment.
Delirium caused by amphetamines may be related to the anticholinergic activity, as observed in different classes of drugs, such as tricyclic antidepressants, benzodiazepines, sedatives, and dopamine-activating drugs. Rapid eye movement during the first phase is decreased during intoxication, and a rebound elevation of rapid eye movement occurs during withdrawal; this effect eventually alters the circadian rhythm and results in sleep disturbances.
Psychosis, delirium, mood symptoms, anxiety, insomnia, and sexual dysfunction are considered rare adverse effects of therapeutic doses of prescription amphetamines. Dextroamphetamine has a slightly increased rate of these adverse effects because of its increased CNS stimulation.
Data about the frequency of amphetamine-related psychiatric disorders are unreliable because of comorbid primary psychiatric illnesses.
Intravenous (IV) use occurs more frequently in people of low socioeconomic status than in those of high socioeconomic status.
The rates for past month use of methamphetamine did not change from 2011 to 2013, remaining at approximately 0.2%. However, this does represent a nearly two-fold increase from the percentage of the population surveyed who had used in the last month in 2010 (0.1%). In 2013, an estimated 144,000 people became new users of methamphetamine, which is consistent with the new user initation rates of the preceding five years. 
Post-marketing studies of amphetamines prescribed to children and adolescents revealed a total of 865 unique case reports describing signs and/or symptoms of psychosis or mania, with nearly half reported in children 10 years or younger. 
The first amphetamine epidemic occurred after World War II in Japan, when leftover supplies intended to counteract fatigue in pilots were made available to the general public. This even resulted in many cases of amphetamine psychosis. Of interest, both German and American troops used these preparations during World War II, as did Japanese kamikaze pilots.
Khat, which is primarily used in Ethiopia for cultural and religious purposes, has been well studied. A house-to-house survey of 10,468 adults showed a lifetime prevalence of khat use of 55.7%. Daily use occurred among 17.4%, and 80% indicated they used khat to increase concentration during prayer.  Khat dependency has been associated with people of Muslim religion and with people of low socioeconomic status.
Khat is also used to cope with the trauma of war in Somalia. One study showed that 36.4% of Somali combatants used khat 1 week prior to being interviewed.
The Drug Abuse Warning Network (DAWN) Annual Medical Examiner Data for 2005 showed 10% of all drug-related hospital emergency department visits were stimulant-related. DAWN data indicated that 26% of all drug-related deaths in Oklahoma City were due to methamphetamine, making it the city's most frequent drug-related cause of death in 1998.
In high doses, prescription amphetamines can produce cardiovascular collapse, myocardial infarction, stroke, seizures, renal failure, ischemic colitis, and hepatotoxicity. Death related to MDMA can occur from malignant hyperthermia, which leads to kidney failure and cardiovascular collapse. Heart attacks, seizures, subarachnoid and intracranial hemorrhage, and strokes may also result in death. The rate of suicide and accidents can increase during periods of toxicity and withdrawal.
In high doses, prescription amphetamines and amphetamine derivatives increase sexual arousal and disinhibition, increasing the risk of exposure to sexually transmitted diseases.
Memory impairment can result after long-term use of high doses of amphetamines because of damage to serotonin-releasing neurons. In the emergency department patients with amphetamine-related disorders are one third more likely than patients with cocaine-related disorders to be transferred to an inpatient psychiatric ward. This difference may partly be because amphetamine withdrawal lasts longer then cocaine withdrawal, and amphetamines are more psychogenic than cocaine.
Amphetamine withdrawal is consistent with a major depressive episode, though lasting less then 2 weeks and involving decreased energy, increased appetite, craving for sleep, and suicidal ideation.
Race-, sex-, and age-related demographics
Amphetamine-related psychiatric disorders most commonly occur in white individuals.
With IV use, amphetamine-related psychiatric disorders most commonly occur in men, with a male-to-female ratio of 3-4:1. With non-IV use, amphetamine-related psychiatric disorders occur equally in men and women.
Amphetamine-related psychiatric disorders most frequently occur in people aged 20-39 years who are inclined to abuse amphetamine derivatives at rave parties and dance clubs.
Adolescents have developed a method for abusing prescription amphetamines in which prescription tablets are crushed into a powder and inhaled nasally.
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