At least two students were served drinks laced with an unidentified substance-reportedly the drug ecstasy-during a Jan. 14 party at the Zeta Beta Tau (ZBT) fraternity house on Dartmouth Street.Sam Vaghar '08, who shared an alcoholic drink with another student at the party, described later experiencing symptoms he thought were consistent with ecstasy. Those symptoms were similar to those published by the National Institute of Drug Abuse, a division of the National Institutes of Health.

The other student sharing the drink, who requested that her name be withheld, reported experiencing similar symptoms.

"Everyone in my fraternity is completely outraged about what happened," ZBT President David McElhoe '06 said. "No one had any part in any of what did or did not occur. We are going to take precautions to make sure this never happens again."

When asked Sunday what those precautions would entail, McElhoe declined to comment.

Vaghar said that when he met with ZBT members last week, they said these precautions would include distributing full beer cans and throwing away any unattended drinks.

Vaghar visited the Health Center and Newton-Wellesley Hospital the morning after the party. He said his urine tests did not determine what drug, if any, he had consumed.

Vaghar said that about 45 minutes after he drank from his cocktail, he stumbled and knew something was wrong. He said he began to feel "wired," and decided to run from the house back to his room in North Quad. He said he did not need to catch his breath upon arriving at his dorm.

According to the N.I.H. Web site, ecstasy "can produce stimulant effects such as an enhanced sense of pleasure and self-confidence and increased energy.

"Physical effects can include muscle tension, involuntary teeth-clenching, nausea, blurred vision, faintness, and chills or sweating," it reads.

Though Vaghar said he never felt extremely sick, the other student who ingested the substance said she suffered more severe symptoms.

Friends of both Vaghar and the other student affected by the supposed drugs said the symptoms of the two students were similar.

"She vomited a lot," a student who accompanied the affected woman that night said. "Her pupils were dilated and she couldn't focus. She was dizzy, she was rambling and she had no control of her body. She was stumbling. She was really out of it."

Students with the young woman also said she complained of sudden changes in body temperature. They asked not to be identified.

Vaghar said that upon his arrival at the party at 11:15 p.m., the basement of the house was hot and dark and that "people were excited because it was the first party of the semester."

According to Vaghar, a female friend asked him to taste her drink as a safety precaution, and he did not hesitate. He said the bartender at the party was serving a mixture of vodka and fruit punch at the time.

Vaghar said that after he sampled the concoction, he watched the bartender mix the same drink for him. He said it contained one shot of vodka.

According to McElhoe, ZBT was readmitted to the national Zeta Beta Tau organization last school year, but he refused to comment on whether this incident would put the fraternity's status in jeopardy.

Vaghar said that the day after the party, he filed a police report with the Waltham Police Department stating what transpired the night before.

Sgt. Timothy King said that his department was working with their Brandeis campus liaison and looking into the case.

McElhoe confirmed that his fraternity had been contacted by the police.

Vaghar said that despite the incident, he still respects ZBT.

"[The brothers were] really cooperative and it seemed like [this incident] concerned them a lot," Vaghar said.

Vaghar said that as a result of this incident, he wants to create awareness on campus so that people know to watch their drinks.

"Keep your eyes open," he said.

-Staff writers Hannah Furst
and Rachel Marder contributed to this article.