The one-time Cleveland Brown was in Humble, Texas, playing in a golf tournament hosted by his Aggie teammate and current Tampa Bay Buccaneers receiver Mike Evans and attending the JMBLYA music festival.
In an appearance on Good Morning America in February, Manziel revealed he had been diagnosed with bipolar disorder and takes medication to treat it.
According to the report from TMZ, Manziel was hospitalized with what his rep is calling a reaction to prescription medication.
Johnny Manziel, the 25-year-old National Football League free agent quarterback, was taken to a Humble, Texas, hospital Monday evening following a concert and a potential prescription drug reaction, sources told TMZ Sports.
Denise Michaels, Manziel's representative, told TMZ it seemed "he had a reaction to an adjustment in his prescription".
Johnny Manziel's latest comeback attempt is on hold. For now, Manziel is doing fine and it appears as if the hospitalization was simply more of a precautionary measure.
In 2015, Manziel was documented for entering a rehab program. The 25-year old QB recently participated in the developmental Spring League and has a standing offer from the CFL's Hamilton Tiger-Cats.