What is the primary use of amphetamines?

Amphetamines are primarily utilized for the treatment of Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy. In ADHD, amphetamines help increase attention and decrease impulsiveness and hyperactivity by enhancing the levels of certain neurotransmitters in the brain, particularly dopamine and norepinephrine. This stimulation of neurotransmitter release is crucial for improving focus and attention in individuals with ADHD.

In the case of narcolepsy, amphetamines assist in alleviating excessive daytime sleepiness and helping individuals stay awake. They promote wakefulness by acting as central nervous system stimulants, which can counteract the symptoms of this sleep disorder.

The other options provided do not align with the primary use of amphetamines. For instance, while some antidepressants may have stimulant-like properties, amphetamines themselves are not primarily used to treat depression. Similarly, they are not indicated as anti-psychotic medications or for managing anxiety, as these conditions typically require different classes of medications for effective treatment.