Fourteen-year-old Anton takes Prozac for his depression. Chemically speaking, Prozac works for Anton primarily by increasing the availability of in his brain.

Serotonin

Explanation:

Prozac works primarily by increasing the availability of serotonin in Anton's brain. It blocks the absorption of the neurotransmitter serotonin in his brain, regulates the amount of serotonin and help in better transmission of messages in his brain cells. These would result to a better, happy and stable mood. Also, serotonin in the prozac drug would help regulate Anton's social behavior, appetite, sleep and memory thereby reducing his depression.