http://www.sabado.pt/vida/detalhe/fentanil-droga-sintetica-que-chega-a-portugal-esta-a-devastar-eua
Citando:
"A epidemia propaga-se com comprimidos, seringas e sprays nasais. É 50 vezes mais potente do que a heroína, fazendo disparar as mortes por overdoses. Um português conta à SÁBADO como ficou agarrado à substância"
Basicamente é droga "aos cochichos", a posse é apesar de tudo ilegal (em alguns países) e os efeitos secundários a médio-longo prazo são completamente desconhecidos:
http://www.bbc.com/news/health-39516345
Citando:
""Microdosing at a medical level, we know absolutely nothing about," he explains.
"The only way that we can sort out whether or not it works is by doing a blinded, placebo-controlled randomised trial."
He says the dangers of people self-medicating like this are currently completely unknown, and that is where the problem lies.
"The definition of a microdose is that you don't notice the subjective effect, but that doesn't mean it's not having any effect on you.
"We don't know what the risks in the long term might be.
"There was some concern before 1970 - when the drugs were being used clinically - that in people who were liable to develop schizophrenia and psychotic disorders, the drugs might actually uncover those problems in some people."
Mais fontes:
http://www.medicaldaily.com/boost-mood-foster-creativity-and-ease-anxiety-lsd-update-popular-microdosing-415281