How much Botox should be injected into depressor septi muscle?

Thank you for your question. Botox will not paralyze the muscle, it will only temporarily relax it. I would recommend seeing a board certified plastic surgeon or dermatologist for an assessment. 2-5 units may be able to help. Regards, 

Botox can be used to relax most facial muscles. Although the depressor septi has some effect on the nose drooping with smiling it is only part of the cause. You may see some improvement but it would be very minor. I would suggest you see a Rhinoplasty surgeon and have your nose examined thoroughly and go through some computer imaging to see what your nose might looks like after treatment.Good luck!

In general you can start with 2 units and see if it works. You can always add more but you can't take away and the risk of using too much in that area would be an absent or crooked smile. Once you know the dose that works for you it's easy to repeat. Hope that helps!