Sudden alcohol tolerance

Please direct me to the proper subreddit if this isn’t the right one to ask this question on.

I’m not a super heavy drinker anymore, but I was during 2020-2023. I’ve never experienced this kind of alcohol tolerance before and I’m not enjoying it at all. I’m trying to figure out what’s causing the tolerance. For reference, I typically don’t drink during the week and only have 5 to 6 drinks (usually hard cider or wine) during the duration of the weekend.

3 weeks ago, I had 8 Twisted Teas in one night and was properly drunk. The next day, I was so hungover that I threw up. Pretty normal for me after having 8.

For the past week, it’s been IMPOSSIBLE to feel alcohol or be hungover. I even tested out the limits of it a few days ago by having a bottle of wine during the day (3 pm to 6 pm) followed by 10 Twisted Teas (7 pm to 2 am) . I felt none of it and was going to have more but I was too bored by feeling nothing that I quit and went to bed. The next day I had no hangover.

I am not pregnant and all my bloodwork is normal. Has anyone heard of such a sudden change happening? The only thing that has changed is that I have been on Cipro for the past 9 days. Other than that, no other changes in my lifestyle.