Short-Term EffectsWhen methamphetamine is injected or smoked it immediately produces an intensely pleasurable sensation known as a "rush" or a "flash" by releasing high levels of dopamine in the brain. Snorting methamphetamine produces an euphoric sensation, but not a rush.
Even taken in small amounts, methamphetamine can cause:
- Increased wakefulness.
- Increased physical activity.
- Decreased appetite.
- Increased respiration.
- Increased heart rate and blood pressure.
- Irregular heart beat.
- Cardiovascular collapse.
- Prolonged insomnia.
Long-Term EffectsChronic meth use can result in:
- Violent behavior.
- Psychotic behavior.
- Auditory hallucinations.
- Mood disturbances.
- Delusions and paranoia.
- Homicidal or suicidal thoughts.
Methamphetamine abuse can produce extreme anorexia. Even over a short period of use, methamphetamine can cause drastic changes in the appearance of the user. See The Face of Meth Use.
OverdoseUnlike other drugs, a methamphetamine overdose gives no immediate signs to users. Users can take a lethal dose and not immediately realize that they have just done so.
An overdose results in a rapid onset of physiological deterioration, eventually leading to a heart attack or stroke. Because of the rapid onset, death occurs suddenly and unexpectedly.
A meth overdose produces profuse sweating, rapid breathing, increased heart rate and dilated pupils. A person who has overdosed on meth with have a high temperature, kidney failure and cardiovascular collapse -- and it will all happen very quickly.
AddictionMethamphetamine is highly addictive and users become physically dependent upon the drug quickly. Meth, like amphetamine, produces a rapid pleasurable feeling, which is followed by feelings of depression and irritability when the drug wears off.
Users will seek and use more methamphetamine in order to get back to that state of pleasure, or to just feel "normal" again, which results in a physical dependence on the drug. It is a never-ending cycle.
WithdrawalPeople who stop using methamphetamine experience a wide variety of symptoms, including:
- Loss of energy.
- Extreme craving for the drug.
- Shaking or tremors.
- Increased appetite.