Synthetic Drug Control Act of 2011 - Amends the Controlled Substances Act to add as schedule I controlled substances: (1) any material, compound, mixture, or preparation which contains specified cannabimimetic agents (or the salts, isomers, or salts of isomers thereof); and (2) specified additional hallucinogenic substances (or the salts, isomers, or salts of isomers thereof).
Extends the period for which the Attorney General may temporarily schedule a substance in schedule I to avoid an imminent hazard to public safety to two years with a one-year extension (currently, one year with a six-month extension).