Abuse during pregnancy may result in prenatal complications, increased rates of premature delivery, and altered neonatal behavioral patterns. Methamphetamine-induced paranoia can result in homicidal or suicidal thoughts. Although no characteristic physical signs of withdrawal are associated with methamphetamine abuse, users report drug craving, depressed mood, sleepiness, and hunger. What is often misunderstood is the relationship between speed and crystal meth. However, its high price prevents it from taking hold.
Speed affects dopamine primarily, a neurotransmitter linked to pleasure and reward.
The two are similar in chemical makeup but one cannot be made from the other. Slightly changing the chemical makeup produces a wholly different effect in the human brain. While both have addictive potential, speed, because of its dopamine ties, is much more profoundly addicting. A recreational drug that is gaining popularity worldwide. No visual effects.