Which of the following medications can help increase energy and reduce sedation?

Mirtazapine is an antidepressant that is often associated with sedative effects, particularly at lower doses. It works primarily by increasing norepinephrine and serotonin levels but can lead to increased sleepiness, making it less suitable for boosting energy levels.

Clonazepam is a benzodiazepine used to treat anxiety and seizure disorders, and it is known for its calming effects. It works by enhancing the effects of GABA, a neurotransmitter that inhibits brain activity, which typically results in sedation rather than an increase in energy.

Dronabinol is a synthetic form of THC, the active component in cannabis, and is primarily used to stimulate appetite and reduce nausea. While it may have some energizing effects for certain individuals, it is more commonly associated with sedation and relaxation, not an increase in energy levels.