The consumption of **ecstasy** negatively affects the driver's behavior by **reducing their ability to concentrate**. This is because ecstasy can cause **hallucinations** and increase **sensitivity to light**, which makes the driver see things in a blurred manner. These effects alter the perception of the environment and make it difficult to maintain the attention necessary to drive safely.

Additionally, ecstasy can cause **depression or anxiety**, which also contributes to the loss of concentration. Although the consumption of ecstasy can lead to feeling **fatigue** once the effects of the drug wear off, the most relevant immediate impact during driving is the reduction in the ability to concentrate. Therefore, it is crucial to avoid driving under the influence of this drug to ensure road safety.