<unk>  (INN), or α-methadol, also known as alfametadol, is a synthetic opioid analgesic. It is an isomer of dimepheptanol (methadol), the other being betamethadol (β-methadol).<unk>  is composed of two isomers itself, L-α-methadol, and D-α-methadol. The former compound, L-α-methadol, is an important active metabolite of levacetylmethadol (LAAM), an opioid substitute drug that is used clinically. Both of<unk> 's isomers bind to and activate the μ-opioid receptor and are active as opioid analgesics, similarly to those of alphacetylmethadol (α-acetylmethadol).
Alphamethadol
Nalorphine
Betamethadol
Levacetylmethadol
Acetylmethadol
Nalorphine dinicotinate
Fentanyl
Naloxone