Manziel confirmed on his Instagram story that the reaction was linked to an increased dosage in Lithium, which he takes for his Bipolar disorder.
Recently, Johnny Manziel was diagnosed with Bi-polar disorder and is now on prescription medication for the disorder.
Former Texas A&M football great Johnny Manziel says a reaction to medication to treat his bipolar disorder sent him to the hospital, adding "it was a scary moment".
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Manziel's representative Denise Michaels told TMZ Sports that Manziel appeared to have had a reaction to an adjustment in his prescription. If Manziel is already out of the hospital, it doesn't appear he was in great danger.
Manziel continues to work on his return to the NFL, having participated in multiple pro days this spring and the Spring League in Austin last month.
It wouldn't surprise us to see Manziel give some more insight into what happened here. For now, Manziel is doing fine and it appears as if the hospitalization was simply more of a precautionary measure.