Posted 10/19/2023 12:54 AM (GMT 0)
I think it's a possibility that the fatigue is just a side effect of the amoxicillin because fatigue is a side effect of several antibiotics and because you felt the symptom only a few hours after taking it, probably too fast for your system to be overloaded by endotoxins from any dead bacteria and cause a herx.
I have not taken amoxicillin for any length of time because I am allergic to all the antibiotics in the cillin family. (It caused me a fever and hives.) I just know it causes fatigue for others sometimes.
I'm sure it's possible that something else is going on for you instead, but for a reaction that fast, with no other changes to your regimen, I would just suspect a side effect of amoxicillin as the most likely explanation. I would not think it's an allergy unless you develop other symptoms (trouble breathing, throat swelling, hives, fever, etc.).
Unless maybe you are reacting to something the dentist did? Or to the stress of going, if applicable?