From: Non-prescribed use of methadone and buprenorphine prior to opioid substitution treatment: lifetime prevalence, motives, and drug sources among people with opioid dependence in five Swedish cities
Route of administration
Methadone (361)
Buprenorphine (330)
Buprenorphine/naloxone (208)
Sublingually
NV
79.7%
85.6%
Snorted
70.6%%
51.0%
Injected
47.4%
40.9%
15.4%
Orally
100.0%
NA