Speed

Speed is part of the amphetamine family of drugs, which also includes ice. Ice is the purest form of the drug followed by base and then speed, however the potential for dependence (addiction) plus physical and mental problems associated with speed is still high.
Speed is also known by a variety of other names, including: whizz, go-ee, snow, zip, point, eve, gogo, pure, and gas.

At normal therapeutic doses, the physical side effects of amphetamine vary widely by age and from person to person. Cardiovascular side effects can include hypertension or hypotension from a vasovagal response, Raynaud's phenomenon (reduced blood flow to extremities), and tachycardia (increased heart rate). Sexual side effects in males may include erectile dysfunction, frequent erections, or prolonged erections. Abdominal side effects may include abdominal pain, appetite loss, nausea, and weight loss. Other potential side effects include blurred vision, dry mouth, excessive grinding of the teeth, nosebleed, profuse sweating, rhinitis medicamentosa (drug-induced nasal congestion), reduced seizure threshold, and tics (a type of movement disorder). Dangerous physical side effects are rare at typical pharmaceutical doses.

Common psychological effects of therapeutic doses can include increased alertness, apprehension, concentration, decreased sense of fatigue, mood swings (elated mood followed by mildly depressed mood), increased initiative, insomnia or wakefulness, self-confidence, and sociability. Less common side effects include anxiety, change in libido, grandiosity, irritability, repetitive or obsessive behaviors, and restlessness; these effects depend on the user's personality and current mental state. Amphetamine psychosis (e.g., delusions and paranoia) can occur in heavy users. Although very rare, this psychosis can also occur at therapeutic doses during long-term therapy. According to the USFDA, "there is no systematic evidence" that stimulants produce aggressive behavior or hostility.
Amphetamine has also been shown to produce a conditioned place preference in humans taking therapeutic doses, meaning that individuals acquire a preference for spending time in places where they have previously used amphetamine.

Methamphetamine may be smoked, snorted, injected, or taken orally. Methamphetamine is commonly referred to as "speed", "meth", or "chalk" and has been in use since the early 1960s. Another common form of the drug is crystal methamphetamine, or "crystal meth", which are clear, chunky crystals resembling ice.