Which of the following is a common effect of MDMA?

The common effects of MDMA, also known as ecstasy, often include physical sensations such as nausea and muscle tension. When individuals consume MDMA, they can experience a range of physical and psychological effects; nausea is a frequent side effect that can occur due to the substance's impact on the body as it interacts with serotonin receptors. Muscle tension is also commonly reported, as MDMA can lead to increased physical activity and involuntary muscle contractions.

While other choices mention effects that might be experienced under specific circumstances or might be associated with other substances, nausea and muscle tension are well-documented and recognized side effects of MDMA consumption, making them a reliable aspect of understanding the drug’s impact on users.