There are certain antibiotics that are okay to take during pregnancy—Zithromax just isn't one of them. (I actually asked about this back when I needed one right after giving birth; I managed to dodge the antibiotics in the end, but honestly, I'd rather forget that whole ordeal)
I ended up with an inflamed elbow joint and had to get a steroid shot injected directly into the muscle—which, if you ask me, felt way worse than labor 😲.
If you want to dig into pregnancy meds (or steroids), there’s more info over here—there's a German site that really gets what you're going through
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link 1 At the end of the link, there's a chart showing which drugs (like Voltaren, for example) pass into breast milk and in what percentages. For some, you aren't supposed to nurse for at least four hours after taking it.
I didn't take anything while I was pregnant. A few times I was dying for something for a toothache, but I held out. Acupuncture helped me get through, though I know not everyone is into that kind of thing.
Go ahead and look for an alternative medication before things get out of hand. Don't make the mistake I did—I waited until the absolute last second (until I couldn't even wipe my own butt, let alone handle everything else... breastfeeding required outside help, too). Then the baby blues hit me like a freight train. I was stubborn, too—if I hadn't gotten professional advice in time, I wouldn't have even made it to the injection stage.