A half dozen teen girls became sick at a Bronx charter school dedicated to teaching students about the law on Tuesday — after they allegedly ate pot brownies, authorities and sources said.

A 911 caller told authorities around 12:15 p.m. that someone at the Charter High School for Law and Social Justice on University Avenue in Morris Heights had consumed marijuana and was having a panic attack, police said.

Cops say medics responded and treated six female students, aged 15 to 16 years old — and three were then taken to Bronx-Lebanon Hospital Center, an FDNY spokesman added.

One freshman recalled she was in her math class that morning when a friend started acting unusual.

“My friend was just sitting down at first. Then she got up and started taking off her sweater, saying she was hot,” the 15-year-old told The Post. “Then she started [hitting her chest] saying she can’t breathe and that she wasn’t feeling well.”

“We thought she was playing at first,” the teen continued. “I didn’t think it was something serious.”

The school was placed on a lockdown for approximately one hour before class was dismissed for the day, students said.

An 18-year-old man was taken into police custody in connection with the incident but was not immediately charged, cops said.

Sources say three of the girls allegedly bought the illicit brownies from the guy — and they called over the other three girls, who ate the stoner sweets too.

The Charter High School for Law and Social Justice is designed to “create a pathway for its students to law school and careers as attorneys,” according to its website.