What is one of the primary effects of methamphetamine?

Methamphetamine is a powerful central nervous system stimulant, and one of its primary effects is increased wakefulness and activity. This stimulant effect is due to its ability to elevate the levels of certain neurotransmitters in the brain, particularly dopamine and norepinephrine, which are associated with alertness, energy, and heightened focus. Users often experience a surge in energy, heightened physical activity, and decreased need for sleep, which is why this option accurately reflects the primary effects of methamphetamine use.

The other options listed do not align with the known effects of methamphetamine. For instance, increased appetite and induced relaxation are typically associated with depressants or substances that have calming effects, rather than stimulants. Similarly, decreased wakefulness is contrary to the stimulating qualities of methamphetamine, which actively promotes vigilance and engagement in activities. Thus, the choice indicating increased wakefulness and activity is clearly representative of the drug's primary stimulatory effects.