Yeah it's a bit early and it certainly isn't first line treatment for someone with a HBA1c of 45 in my opinion.
If your HBA1c is only 45 then lifestyle changes will have a much more immediate impact on treating pre-diabetes than medication. Plus, medication without lifestyle changes (exercise + weight control + diet) will make close to zero difference.
You're only just in the prediabetic range. Have you considered tweaking your diet a little? A couple of small changes could well be enough, seeing as you're below diabetes levels.