Schedule IV [21 CFR 1308.14]
Source: Shulgin, Alexander T. Controlled Substances: Chemical & Legal Guide to Federal Drugs Laws (2nd edition). Ronin Publishing Inc., Berkeley, 1992
Source: DEA Office of Diversion Control: Section 1308: Schedules of Controlled Substances
Effective 14 Mar 1977, 42 FR 8636 added:
(g)
Other substances. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture or preparation which contains any quantity of the following substances, including its salts:
Effective 14 Mar 1977, 42 FR 8636 added:
8121
Dextropropoxyphene (Alpha-(+)-4-dimethylamino-1,2-diphenyl-3-methyl-2-propionoxybutane)
US: Currently at CSA Schedule IV Section b Subsection 2 Dextropropoxyphene
Effective 9 Feb 1979, 44 FR 2169 added:
(1)
9709
Pentazocine
CA: CDSA Schedule I Section 11 Subsection 3 Pentazocine
⇒
PubChem: 4736; ChemSpider: 390041; Bluelight: Pentazocine; Drugs Forum: Pentazocine; Wikipedia: Pentazocine
Effective 31 Oct 1997, 62 FR 51370 added:
On 10 Jul 1997, 62 FR 37004 proposed to add:
(2)
9720
Butorphanol (including its optical isomers)
CA: CDSA Schedule IV Section 9 Butorphanol
Effective 17 Dec 2015, 80 FR 70680 corrected rule 80 FR 69861 by moving the effective date to 14 Dec 2015 from 17 Dec 2015
Effective 14 Dec 2015, 80 FR 69861 added:
On 11 Aug 2015, 80 FR 48044 proposed to add:
(3)
9725
11 March 2016 · 
· Isomer Design
· Isomer Design