Medina went missing around 8:20 p.m. on Saturday in the 3000 block of West Buckingham Rd. in Garland, Texas, police said.
David Maldonado, 20, who is Medina's ex-boyfriend, is the suspect, according to police.
Maldonado is Hispanic, 5 feet 7 inches tall, weighs 160 pounds, and has black hair and brown eyes.
On scene, officers spoke with a witness who said they saw Medina being dragged into a white Ford or GM pickup truck with tan or silver trim against her will.
The witness said they recognized the suspect as Medina's ex-boyfriend.
The vehicle then left the area, driven by a third person, traveling westbound on Buckingham Road, police said.
Officials said the investigation remains active.
The Garland Police Department asks anyone with information to call them immediately at 972-485-4840.