"Studies reporting estimates of high-risk drug use can help to identify the extent of the more entrenched drug use problems, while data on first-time entrants to specialised drug treatment centres, when considered alongside other indicators, can inform an understanding of the nature of and trends in high-risk drug use.
"A 2011 study estimated that there were 8 000 people who inject drugs in Sweden, the majority of whom used opioids and/or amphetamine. There is no national estimate on the prevalence of high-risk drug use by substance.
"Data from drug treatment providers indicate that opioids, cannabis and stimulants remained important among first-time clients entering treatment in 2017. Approximately 3 out of 10 treatment clients in Sweden are female; however, the proportion of females in treatment varies by type of primary drug and programme. In the last decade, the treatment demand registration system in Sweden has undergone changes, which need to be considered when interpreting the data."