How long after Botox injections can side effects start?

Botox functions for 4 hours after injection.  It is then deactivated and removed from the body.  Very very unlikely that Botox has anything to do with your pain and swelling.  A reasonable guess would be that the needle itself caused a minimal scar band which snapped, and this localized irritation caused swelling. Obviously, this is a supposition on my part, but it is as good as any other. I recommend you call your injector and see what he or she recommends.  Thank you for this interesting question.

This is unlikely related to botox especially now that it's a month post treatment.  You should follow up with your family doctor and be assessed.

Thank you for your questions.  Botox injections are unlikely to cause a feeling of being punched one-month after injection.  Best to follow up with your doctor.  Best of luck.

Botox results begin to take effect at 10-14 days and last for 3-4 months. I suggest you see an expert.  Best, Dr. Emer.

Thank you for your question. It is very unlikely this id related to your Botox treatment especially after 1 month. I recommend having a follow up with your injection for an evaluation. Best of Luck!

Botox usually takes 7-14 days for full effect. At this point 1 month after your injection, it is highly unlikely that Botox has anything to do with your symptoms. That being said, I do recommend you discuss the issue with your injector.

Generally Botox reaches its maximal effect 5- 10 days after injection. So it would be unlikely that it caused your symptoms.

Happily, the neurotoxin in Botox is deactivated and removed from your body in about 4 hours. Even so, the effects last for about 90 days.  It would be pretty unusual that a month after your injections you suddenly had symptoms at the injection site.  If your symptoms persist, I would recommend that you return to the physician who injected you to see if they have any suggestions or answers.  I would bet it's a completely unrelated issue, like allergies, or even an atypical migraine and not from the Botox injections.