Psychoactive drugs are often used in the treatment of addiction to other psychoactive drugs.
a. Name one drug that is used as an agonist in the treatment of heroin dependence. In a few sentences, describe the pharmacodynamic effect of this drug, showing that you understand the drug's biochemical action in the brain.
b. Now name a drug that is an antagonist to heroin. How does it differ in both use and biochemical action from the drug you names in (a)?
c. In your opinion, is it appropriate to use psychoactive drugs as therapy in treating addiction to psychoactive drugs?