Final answer:
The phenobarbital tolerance test is helpful in detox from barbiturates, which are CNS depressants with addiction and overdose potential. The test determines an individual's tolerance to barbiturates, aiding in the detoxification process.
Step-by-step explanation:
Phenobarbital tolerance test is a medical test that is helpful in detox from barbiturates. Barbiturates are central nervous system depressants that are used for their sedative, hypnotic, and anticonvulsant effects. However, they also have addiction and overdose potential, and barbiturate withdrawal can be life-threatening. The phenobarbital tolerance test helps to determine an individual's tolerance to barbiturates, which is important when detoxifying from these substances.