Effects

The amphetamine effect is like an adrenaline rush, only longer and with a noticeable crash.

Swallowed, an amphetamine pill will come on within 15 to 30 minutes. Snorted, the effects are much quicker (5 to 10 minutes). Injection is almost instantaneous and can be overwhelming.

sensations

The sensations start as a tickling upwards from the stomach. There is often a sense of rushing forwards. The mind feels clear and focused, more powerful, but in a more calculated way than the arrogant me-me-me effect of cocaine.

Physically, the teeth start grinding. The jaws clench. Long term addicts can actually crush their teeth to powder through incessant gnawing. Appetite is also strongly suppressed and the need to go to the restroom decreases substantially. Blood pressure and heart rate both tend to rise.

Mentally, you start to feel confident and elated, along with an increased desire to communicate. As the whole Central Nervous System (CNS) becomes stimulated, your alertness and endurance increases. Often users talk fast and continually.

Speed is colder, more physical, and in many ways more unforgiving than Ecstasy.

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comedown

Small doses of speed (one line, one pill) wear off 3-8 hours later, leaving you fatigued but not exhausted. Hence the strong temptation to "top up", slang for taking another dose, and continue speeding. This staves off the comedown but increases its severity. Eventually you face a "crash" rather than a manageable come down.