You should be able to proceed with your Botox treatment if you are taking erythromycin for a tooth infection. If you have an active infection near the treatment area it is recommended to wait until the infection has resolved before having your Botox treatment.

Since botox is injected locally and remains in the muscles in which it is injected, there should be no problem to have it injected while on antibiotics. Botox is injected in small amounts and is not absorbed systemically requiring metabolism/excretion by the liver/kidneys, therefore it would not interfere with the metabolism of the antibiotic.

I would recommend you wait 1 week after you have completed your antibiotics before having any toxins

Yes, you can Have botox while on antibiotics including erythromycin as long as whatever infection you are dealing is not close to where you are being injected with botox. There are no contraindications.

If you have been on antibiotics for a few days already, and the infection is under control, I see no problem with you getting Botox. I personally would not treat close to that area (for example in the jaw muscles or around the mouth) just to be on the safe side.