Check out Erowid.org
It tells you literally everything you need to know about anything you want.
It also tells you effects, duration.
Also it shows user experiences.
Myself, I have never done it but its speed, it makes you super energetic
According to Erowid
POSITIVE
increased alertness
increased motivation
increased sociability / talkativeness
positive mood shift, sense of well-being
increased sex drive
NEUTRAL
reduced appetite (anorexia)
dilated pupils
flushing
loss of coordination (at high doses)
restlessness
NEGATIVE
(likelihood of negative side effects increases with higher doses)
increased aggressiveness
paranoia
dry mouth
headache
increased heart rate (tachycardia)
increased breathing rate
increased blood pressure
rise in body temperature
fever and sweating
diarrhea or constipation
blurred vision
impaired speech
dizziness
uncontrollable movements (twitching, jerking, tremors, etc...)
insomnia
numbness
irregular heartbeat (palpitations, arrhythmia)
impotence / inability to achieve erection in men (high dose or chronic use)
convulsions (high dose)
dry, itchy skin (chronic use)
acne, sores (chronic use)
pallor (high dose or chronic use)
psychotic episodes (rare except in overdoses or after chronic use)
I wouldnt do it