Three of four Wesleyan University students are due in court Wednesday on drug charges related to about a dozen hospitalizations among people who took a party drug known as Molly.

Eric Lonergan, of Rio de Janeiro; Zachary Kramer, of Bethesda, Maryland; and Rama Agha Al Nakib, of Lutherville, Maryland, are due in Middletown Superior Court.

Police say Andrew Olson, of Atascadero, California, posted bond Tuesday and is due in court March 3.

The student were arrested on assorted drug charges and suspended from the university.

Eleven Wesleyan students, some of whom had attended a rave music show on Saturday night, received medical attention over the weekend, police said. Two students were still being treated Tuesday, they said.

Police officers trying to find out who supplied the Molly and collect evidence in the case searched locations in and around Wesleyan's campus in Middletown, Chief William McKenna said. Authorities from various agencies worked to identify the different types of chemicals in the batch of Molly that caused the weekend overdoses, he said.

"This particular batch may have had a mixture of several kinds of designer drug chemicals, making the health risks unpredictable and treatment to combat the effects complex and problematic," he said.

Lonergan is accused of possessing a controlled substance and illegally obtaining or supplying drugs, while Olson faces charges of possessing and selling a hallucinogen. Kramer is accused of possessing drug paraphernalia, a regulated substance and a small amount of marijuana. Al Nakib is accused of possessing a controlled substance, a controlled substance with intent to sell it and drug paraphernalia.

Wesleyan president Michael Roth said the university takes drug distribution allegations seriously and is cooperating with authorities.

"We will do everything we can to make our community as safe as possible," he said in a statement.

Roth had sent a letter to people on campus on Monday asking for help: "If you are aware of people distributing these substances, please let someone know before more people are hurt," he said then.

The university became aware of the Molly problem early Sunday after several students showed up seeking treatment at a hospital near campus, university spokeswoman Lauren Rubenstein said. Two students listed in critical condition Sunday were airlifted for treatment in Hartford, 20 miles north of campus.

Molly is a term used to describe a refined form of Ecstasy, a synthetic drug also known as MDMA. It can drive up body temperature and cause liver, kidney or cardiovascular failure.

Dr. Mark Neavyn, chief of toxicology at Hartford Hospital, said users who believe they are taking Molly are often receiving different kinds of designer drugs, with ranges of purity and potency making the health risks unpredictable.

The weekend rash of Molly hospitalizations wasn't the first such episode this year at the private university of nearly 3,000 students.

Wesleyan health officials said in a campus-wide email on Sept. 16 that students had been hospitalized the previous two weekends after taking Molly. Students were urged to visit the university's health center if they had questions or concerns.

The police chief said the safety and welfare of community members, including those on the Wesleyan campus, were his top priority.

"Incidents jeopardizing the safety will not be tolerated," he said, "and those offenders will be held accountable."