Although chemically unlike morphine or heroin, methadone also acts on the opioid receptors and thus produces many of the same effects. Methadone is also used in managing chronic pain owing to its long duration of action and very low cost.
Read More From Wikipedia
Effects of methadone include:
* hypoventilation
* constipation
* constricted pupils
* nausea
* low blood pressure
* hallucination
* headache
* vomiting
* cardiac arrhythmia
* anorexia (symptom)
* weight gain
* stomach pain
* dry mouth
* perspiration
* flushing
* itching
* difficulty urinating
* swelling of the hands, arms, feet, and legs
* mood changes
* blurred vision
* insomnia
* impotence
* skin rash
* seizures
* death
Physical symptoms:
* lightheadedness
* tearing
* sneezing
* nausea
* vomiting
* diarrhea
* fever
* chills
* tremors
* tachycardia
* aches and pains, often in the joints and/or legs
* elevated pain sensitivity
* elevated blood pressure
Cognitive symptoms:
* suicidal ideation
* depression
* adrenal exhaustion
* adrenal fatigue
* spontaneous orgasm
* prolonged insomnia
* delirium
* auditory hallucinations
* visual hallucinations
* increased perception of odors (olfaction), real or imagined
* marked decrease in sex drive
* agitation
* anxiety
* panic disorder
* paranoia
* delusions