Ritalin: 20 mg sustained-release (SR) tablets
Two pairs of enantiomers: ephedrine (top) and pseudoephedrine (bottom)
A chart comparing the chemical structures of different amphetamine derivatives
A warning at an Australian pharmacy
Roasted coffee beans, a common source of caffeine.
Tablets containing MDMA
Lines of illicit cocaine, used as a recreational stimulant
Catha edulis

Stimulants (also often referred to as psychostimulants or colloquially as uppers) is an 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

Pseudoephedrine (PSE) is a sympathomimetic drug of the phenethylamine and amphetamine chemical classes.

- Pseudoephedrine

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

- Pseudoephedrine

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

- Sympathomimetic drug

Known reports of such hypersensitivity reactions include the use of pseudoephedrine, phenylpropanlolamine, methamphetamine and other drugs at prescribed doses as well as at over-doses.

- Sympathomimetic drug

Pseudoephedrine is used to relieve nasal or sinus congestion caused by the common cold, sinusitis, hay fever and other respiratory allergies; it is also used to relieve ear congestion caused by ear inflammation or infection.

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

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Ephedrine Sulphate (1932), Ephedrine Compound (1932), and Swan-Myers Ephedrine Inhalant No. 66 (circa 1940)

Ephedrine

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Ephedrine Sulphate (1932), Ephedrine Compound (1932), and Swan-Myers Ephedrine Inhalant No. 66 (circa 1940)
Ephedrine tablets
Proposed biosynthetic pathway of ephedrine from L -phenylalanine and pyruvic acid.
The four stereoisomers of ephedrine
<center>Norephedrine</center>
<center>Ephedrine</center>
<center>N-Methylephedrine</center>

Ephedrine is a central nervous system (CNS) stimulant that is often used to prevent low blood pressure during anesthesia.

Both ephedrine and pseudoephedrine increase blood pressure and act as bronchodilators, with pseudoephedrine having considerably less effect.

Ephedrine is a sympathomimetic amine and substituted amphetamine.