Because continued use of the drug decreases natural feelings of hunger, users can experience extreme weight loss. Negative effects can also include disturbed sleep patterns, hyperactivity, nausea, delusions of power, increased aggressiveness and irritability.
Other serious effects can include insomnia, confusion, hallucinations, anxiety and paranoia.1 In some cases, use can cause convulsions that lead to death.
Long-range damage
In the long term, meth use can cause irreversible harm: increased heart rate and blood pressure; damaged blood vessels in the brain that can cause strokes or an irregular heartbeat that can, in turn, cause cardiovascular2 collapse or death; and liver, kidney and lung damage.
Users may suffer brain damage, including memory loss and an increasing inability to grasp abstract thoughts. Those who recover are usually subject to memory gaps and extreme mood swings.
METH HARM
SHORT-TERM EFFECTS
Loss of appetite
Increased heart rate, blood pressure, body temperature
Dilation of pupils
Disturbed sleep patterns
Nausea
Bizarre, erratic, sometimes violent behavior
Hallucinations, hyperexcitability, irritability
Panic and psychosis
Convulsions, seizures and death from high doses
LONG-TERM EFFECTS
Permanent damage to blood vessels of heart and brain, high blood pressure leading to heart attacks, strokes and death
Liver, kidney and lung damage
Destruction of tissues in nose if sniffed
Respiratory (breathing) problems if smoked
Infectious diseases and abscesses if injected
Malnutrition, weight loss
Severe tooth decay
Disorientation, apathy, confused exhaustion
Strong psychological dependence
Psychosis
Depression
Damage to the