Can you get the Pfizer vaccine 4 days after Botox in forehead and does it reduce the efficacy of the 2nd dose?

There has yet to be any reports of covid vaccine interactions or effects on botulinum toxins like Botox and Dysport. A few rare reports of easily treated swelling have been reported with fillers.

The vaccine and botox have no evidence of negative reactions towards each other. Technically, you could even get them done on the same day. Botox will not affect the efficacy of the vaccine or vise versa.