Which effects are caused by MDMA when consumed?

MDMA, commonly known as "Ecstasy," primarily produces effects characterized by increased energy and euphoria. It stimulates the release of serotonin, dopamine, and norepinephrine in the brain, which can lead to heightened mood, feelings of emotional closeness, and an overall sense of well-being. Users often experience bursts of energy, making social interactions more enjoyable and engaging.

In contrast, the other effects suggested by the other options are not typically associated with MDMA use. For instance, relaxation and drowsiness are more likely to be experienced with depressants like alcohol or opioids. Visual hallucinations and confusion can occur with hallucinogens, which are not effects of MDMA. Lastly, increased appetite and sedation are generally linked to other substances, not the energizing and euphoric properties that MDMA is known for. This distinguishes MDMA's effects as primarily stimulatory, further solidifying increased energy and euphoria as the correct choice.