Stimulant

Ritalin: 20 mg sustained-release (SR) tablets
A chart comparing the chemical structures of different amphetamine derivatives
Roasted coffee beans, a common source of caffeine.
Tablets containing MDMA
Lines of illicit cocaine, used as a recreational stimulant
Catha edulis

Overarching term that covers many drugs including those that increase activity of the central nervous system and the body, drugs that are pleasurable and invigorating, or drugs that have sympathomimetic effects.

- Stimulant
Ritalin: 20 mg sustained-release (SR) tablets

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Modafinil

Modafinil tablets – Modalert 200

Modafinil, sold under the brand name Provigil among others, is a central nervous system (CNS) stimulant medication used to treat sleepiness due to narcolepsy, shift work sleep disorder, and obstructive sleep apnea.

A job applicant exhibiting a facial configuration that in certain cultures is an expression of worry.

Paranoia

Instinct or thought process that is believed to be heavily influenced by anxiety or fear, often to the point of delusion and irrationality.

Instinct or thought process that is believed to be heavily influenced by anxiety or fear, often to the point of delusion and irrationality.

A job applicant exhibiting a facial configuration that in certain cultures is an expression of worry.

Drug-induced paranoia, associated with cannabis, amphetamines, methamphetamine and similar stimulants has much in common with schizophrenic paranoia; the relationship has been under investigation since 2012.

Uncoated aspirin tablets, consisting of about 90% acetylsalicylic acid, along with a minor amount of inert fillers and binders. Aspirin is a pharmaceutical drug often used to treat pain, fever, and inflammation.

Drug

Any chemical substance that causes a change in an organism's physiology or psychology when consumed.

Any chemical substance that causes a change in an organism's physiology or psychology when consumed.

Uncoated aspirin tablets, consisting of about 90% acetylsalicylic acid, along with a minor amount of inert fillers and binders. Aspirin is a pharmaceutical drug often used to treat pain, fever, and inflammation.
Nexium (Esomeprazole) is a proton-pump inhibitor. It is used to reduce the production of stomach acid.
An Amazonian shaman
San Pedro, a psychoactive cactus.
Cannabis is a commonly used recreational drug.

These drugs are divided into different groups like: stimulants, depressants, antidepressants, anxiolytics, antipsychotics, and hallucinogens.

Lisdexamfetamine

30mg Vyvanse capsules
Dextroamphetamine concentrations after oral administration of a single equimolar dose of dextroamphetamine sulfate immediate-release (IR) (40 mg; equivalent to 30 mg dextroamphetamine free-base) and lisdexamfetamine dimesylate (100 mg) in healthy adults. Cmax, t1/2, and AUC∞ were all similar between the two drugs, while tlag (1.5 hours vs. 0.8 hours) and tmax (4.6 hours vs. 3.3 hours) were longer for lisdexamfetamine than with dextroamphetamine.
Elvanse Adult capsules 50mg and 70mg laid on the packaging (German)

Lisdexamfetamine, sold under the brand name Vyvanse among others, is a stimulant medication that is mainly used to treat attention deficit hyperactivity disorder (ADHD) in people over the age of five as well as moderate-to-severe binge eating disorder in adults.

Addiction experts in psychiatry, chemistry, pharmacology, forensic science, epidemiology, and the police and legal services engaged in delphic analysis regarding 20 popular recreational drugs. Ecstasy was ranked 18th in dependence, physical harm, and social harm.

MDMA

Psychoactive drug primarily used for recreational purposes.

Psychoactive drug primarily used for recreational purposes.

Addiction experts in psychiatry, chemistry, pharmacology, forensic science, epidemiology, and the police and legal services engaged in delphic analysis regarding 20 popular recreational drugs. Ecstasy was ranked 18th in dependence, physical harm, and social harm.
MDMA induced transporter reversal on human serotonin transporters (SERT), which leads to serotonin release.
In the serotonergic neurons of humans, extracellular MDMA releases serotonin via serotonin transporters (SERT). Intracellular MDMA inhibits VMAT2 and, to a much lesser extent, MAO-A.
Main metabolic pathways of MDMA in humans.
Alexander and Ann Shulgin in December 2011
A 1995 Vibe Tribe rave in Erskineville, New South Wales, Australia being broken up by police. MDMA use spread globally along with rave culture.
UNODC map showing the use of ecstasy by country in 2014 for the global population aged 15–64

It belongs to the substituted amphetamine classes of drugs and has stimulant and hallucinogenic effects.

The bacterium Escherichia coli (E. coli), is a single-celled prokaryote

Sympathomimetic drug

Sympathomimetic drugs (also known as adrenergic drugs and adrenergic amines) are stimulant compounds which mimic the effects of endogenous agonists of the sympathetic nervous system.

Sympathomimetic drugs (also known as adrenergic drugs and adrenergic amines) are stimulant compounds which mimic the effects of endogenous agonists of the sympathetic nervous system.

The bacterium Escherichia coli (E. coli), is a single-celled prokaryote

Thus, all sympathomimetic amines fall into the larger group of stimulants (see psychoactive drug chart).

Both pupils are dilated (mydriasis) because of hyper-activation of the sympathetic system caused by the recreational psychedelic drug LSD

Mydriasis

Dilation of the pupil, usually having a non-physiological cause, or sometimes a physiological pupillary response.

Dilation of the pupil, usually having a non-physiological cause, or sometimes a physiological pupillary response.

Both pupils are dilated (mydriasis) because of hyper-activation of the sympathetic system caused by the recreational psychedelic drug LSD

Stimulants (typically monoaminergics) such as amphetamines, cocaine, MDMA, and mephedrone.

Uncoated aspirin tablets, consisting of about 90% acetylsalicylic acid, along with a minor amount of inert fillers and binders. Aspirin is a pharmaceutical drug often used to treat pain, fever, and inflammation.

Anorectic

Drug which reduces appetite, resulting in lower food consumption, leading to weight loss.

Drug which reduces appetite, resulting in lower food consumption, leading to weight loss.

Uncoated aspirin tablets, consisting of about 90% acetylsalicylic acid, along with a minor amount of inert fillers and binders. Aspirin is a pharmaceutical drug often used to treat pain, fever, and inflammation.

Drugs of this class are frequently stimulants of the phenethylamine family, related to amphetamine.

Two pairs of enantiomers: ephedrine (top) and pseudoephedrine (bottom)

Pseudoephedrine

Sympathomimetic drug of the phenethylamine and amphetamine chemical classes.

Sympathomimetic drug of the phenethylamine and amphetamine chemical classes.

Two pairs of enantiomers: ephedrine (top) and pseudoephedrine (bottom)
A warning at an Australian pharmacy

It may be used as a nasal/sinus decongestant, as a stimulant, or as a wakefulness-promoting agent in higher doses.

Racemic amphetamine skeleton

Substituted amphetamine

Substituted amphetamines are a class of compounds based upon the amphetamine structure; it includes all derivative compounds which are formed by replacing, or substituting, one or more hydrogen atoms in the amphetamine core structure with substituents.

Substituted amphetamines are a class of compounds based upon the amphetamine structure; it includes all derivative compounds which are formed by replacing, or substituting, one or more hydrogen atoms in the amphetamine core structure with substituents.

Racemic amphetamine skeleton
This shows phenethylamine in blue with its substitution points marked. Amphetamine and its substituted derivatives contain a CH3 group at the alpha-position (Rα).
This shows amphetamine with its substitution points marked, excluding the N-position at the NH2 group which is unmarked.
Amphetamine pills

The compounds in this class span a variety of pharmacological subclasses, including stimulants, empathogens, and hallucinogens, among others.