Amphetamine and Methamphetamine hydrochloride

Amphetamine noun - A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression.

Methamphetamine hydrochloride and amphetamine are semantically related. In some cases you can replace phrase "Methamphetamine hydrochloride" with "Amphetamine", this terms are similar.

Methamphetamine hydrochloride noun - An amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant.

Amphetamine and methamphetamine hydrochloride are semantically related. Sometimes you can use "Amphetamine" instead a noun phrase "Methamphetamine hydrochloride".