Final answer:
Sedatives are the correct classification of drugs used to lessen pain and anxiety by reducing GABA neurotransmission and becoming endorphin agonists.
Step-by-step explanation:
The correct classification of drugs used to help lessen pain and anxiety by reducing the neurotransmission of GABA or becoming endorphin agonists is Sedatives. Sedatives are a type of depressant drug that slow down the central nervous system, helping to induce relaxation and reduce anxiety. They work by increasing the activity of the neurotransmitter GABA, which has a calming effect on the brain.
Learn more about Classification and effects of sedative drugs