Final answer:
The adverse effects of MDMA, also known as ecstasy, include hypertension and tachycardia, rather than respiratory depression, relaxation, increased appetite, or weight gain. It is a stimulant with significant acute health risks at high doses.
Step-by-step explanation:
The adverse effects of ecstasy (MDMA) are best described as hypertension and tachycardia. MDMA, commonly known both as ecstasy and Molly, is a psychoactive drug of the amphetamine class with stimulant properties. When taken in recreational doses, it poses a significant risk of serious side effects such as increased blood pressure (hypertension) and a rapid heart rate (tachycardia), as well as potential for dependency with repeated use. Although it may cause euphoria and social disinhibition in users, these effects are countered by negative consequences like nausea, insomnia, and acute health risks at high doses, which can include organ damage or death. Therefore, MDMA's adverse effects align most closely with the stimulant effects mentioned rather than with respiratory depression, relaxation, appetite increase, or weight gain.