What are combinations used with stimulants?

Stimulants used with opioid (in same syringe, better quality than stimulant alone, IV use + Heroin is called speed balling) Amphetamine and opioid oral also is common, CNS depressants (alcohol/benzodiazepines/opioids/marijuana are used after cocaine use to temper unpleasant effects of cocaine intoxicity (anxiety/paranoia/restlessness) and relieve withdrawal symptoms.