Image copyright Courtney Roland Facebook Image caption The woman's phone was in her car, parked at a Houston shopping mall

A Texas sports journalist went missing over the weekend after a severe reaction to medication made her disoriented, say police.

Courtney Roland, 29, was found unharmed under an overpass near a Houston shopping centre early on Monday.

She had been missing since leaving a Texas A&M football camp in the city at about 16:00 local time on Saturday.

Her roommate told local media Ms Roland had texted her that she was being followed by a blue truck.

Ms Roland's mother reportedly received a text on Sunday saying: "hello the owner of this phone Courtney. I am buying an iPad."

Houston Police said the journalist was taken to hospital for evaluation after she was discovered near the Galleria mall.

Ms Roland had become confused after experiencing a negative reaction to medication, police told a news conference on Monday.

Her father, Steve Roland, told the Houston Chronicle: "We don't have too many details right now; we're just happy she's OK."

After going missing, Ms Roland was seen walking alone at the Houston mall on Sunday evening, police said.

Her car was found, with her phone and belongings inside it, near the shopping centre overnight.