Stimulant Use Disorders

Core Concepts

The mechanism: dopamine, norepinephrine, and the "go" system

Think of stimulants as stepping on the brain's accelerator. Dopamine surges in the reward pathway create intense reinforcement ("this feels great, do it again"), which is why craving is so powerful. Norepinephrine surges produce the sympathetic storm: tachycardia, hypertension, sweating, dilated pupils, hyperthermia, and agitation. With chronic use the brain adapts — dopamine stores are depleted — so users often feel flat, tired, and depressed between doses.

Cocaine versus methamphetamine: same class, different clock

Cocaine's effects peak fast and fade within about an hour, driving frequent redosing ("bingeing"); methamphetamine's effects last many hours with more prolonged dopamine-neuron depletion. Clinically, methamphetamine is associated with longer psychotic episodes and more visible deterioration (severe dental problems, weight loss), while cocaine's rapid onset makes acute cardiac events — arrhythmias, chest pain, stroke in young people — a particular concern (review flag: verify duration and risk estimates).

Acute intoxication, toxicity, and psychosis

An acutely intoxicated person may be talkative and euphoric — or anxious, paranoid, and combative. Dangerous possibilities:

• Sympathetic overdrive: very high heart rate and blood pressure, dangerous hyperthermia, dehydration.
• Cardiovascular events: chest pain, arrhythmias, stroke — even in young, healthy people.
• Stimulant-induced psychotic disorder: paranoia and hallucinations (often auditory or tactile, such as feeling bugs under the skin). It typically clears with abstinence but must be assessed by a clinician.

The nursing response to an agitated, paranoid patient is safety-focused: a calm, quiet environment; simple, nonthreatening communication; objective documentation; and prompt reporting per facility policy. De-escalation happens within the team's plan — never improvisation, and never a substitute for calling for help when the person is unsafe.

Tolerance, sensitization, and withdrawal

• Tolerance develops to euphoria and appetite suppression, so doses escalate.
• Sensitization (reverse tolerance) can develop for psychotic effects — psychosis can appear at lower doses over time.
• Withdrawal ("the crash") includes fatigue, sleep disturbance, increased appetite, depressed mood, and intense craving. Usually not physically dangerous, but severe depression and suicidality are real — take hopelessness seriously and escalate; experiences vary.

Prescribed stimulants: treatment versus misuse

Amphetamine-based and methylphenidate medications are standard, evidence-based treatments for ADHD when prescribed and monitored by a qualified clinician. Misuse is separate: taking someone else's medication, exceeding prescribed doses, crushing and snorting pills, or nonmedical use for performance or recreation. Two errors to avoid: assuming every person taking a stimulant is misusing it, and minimizing diversion because the drug is prescribed.

Historical and ethical context

Cocaine was isolated in the 1800s, promoted as a local anesthetic, and famously endorsed then retracted by Sigmund Freud; it was even an ingredient in Coca-Cola until the early 1900s. Methamphetamine was used during wartime for alertness and later prescribed for conditions including depression before its risks became clear. These histories show how medical enthusiasm can outrun evidence. The reward-pathway science began with classic animal studies such as Olds and Milner's 1954 discovery of brain-stimulation reward: rats with electrodes in certain brain regions pressed levers to stimulate those regions, sometimes neglecting food and water. Methodological context: electrical stimulation is not identical to drug action, and the "reward" interpretation was debated — famous findings are early steps, not final answers.

Common Confusions