A Westbury man was sentenced to six years in prison Friday after prosecutors said he sold fentanyl mixed with the veterinary tranquilizer xylazine and kept large quantities of narcotics and multiple explosive devices in the basement of his home.
Anthony Gianatiempo, 35, was also sentenced to five years of post-release supervision, Nassau County District Attorney Anne Donnelly announced Aug. 7.
Gianatiempo pleaded guilty June 2 before Judge Caryn Fink to third-degree criminal sale of a controlled substance, a felony, and attempted first-degree criminal possession of a weapon, a violent felony.
Prosecutors said Gianatiempo left his Cantiague Lane home in Westbury on an electric bicycle on June 18, 2025, and traveled to Cantiague Park, where he sold narcotics to another person for $820.
The drugs sold included heroin, cocaine, fentanyl, ketamine and alprazolam, according to the DA’s office.
One bag containing fentanyl, ketamine and heroin also contained xylazine, a veterinary tranquilizer commonly known as “tranq,” prosecutors said.
The investigation led the Nassau County District Attorney’s Office, Nassau County Police Department and Drug Enforcement Administration to execute a search warrant at Gianatiempo’s home on Aug. 5, 2025.
Authorities said they recovered 63 grams of heroin, 39 grams of fentanyl and 69 grams of methamphetamine, along with cocaine and ketamine.
Investigators also found cardboard tubes with fuses wrapped in blue and black tape and a bottle wrapped in black electrical tape with a fuse in Gianatiempo’s basement bedroom, according to prosecutors.
Smokeless powder was attached to his bedroom door, the DA’s office said. Counterfeit U.S. currency was also recovered.
The narcotics were found throughout the basement, including Gianatiempo’s bedroom and a workstation area outside the bedroom, prosecutors said.
Investigators also recovered 15 grams of N-Pyrrolidino Isotonitazene from a black handbag on the floor near Gianatiempo’s bedroom.
The substance is a nitazene, a class of powerful synthetic opioids. Donnelly’s office said N-Pyrrolidino Isotonitazene is not currently listed among controlled substances in Schedules I through IV of New York’s Public Health Law and generally cannot be charged unless it is mixed with another scheduled substance.
Donnelly again called on state lawmakers to add xylazine and additional nitazene compounds to New York’s controlled-substance schedules.
“Inside Anthony Gianatiempo’s basement was a dangerous collection of deadly drugs and hazardous explosives that had the potential to injure or kill Nassau County residents,” Donnelly said.
Gianatiempo was arrested in Hicksville by Nassau County police on Aug. 5, 2025.
The case was prosecuted by Senior Assistant District Attorney Rivka Shuter of the Narcotics, Firearms, and Gangs Bureau and Senior Assistant District Attorney and Arraignment Supervisor Victoria Sepe. Gianatiempo was represented by Guy J. Allen.
