Can you gain weight from 100 units of Botox injected into your underarms?

I do not think your weight gain is the result of the Botox injection.  A change in lifestyle, eating habits, sleeping routine, exercise, etc…. are all associated with changes in your weight.  Botox is not.  I guess the so called freshman 15 can be real!  

Hello, Thank you for your question. Weight gain is not an associated side effect of a Botox injection. Take care. 

There is no way that botox can cause weight gain. I suggest you see a cosmetic dermatologist with experience in botox and consider an internal evaluation to ensure there is nothing hormonally going on with you.  Best, Dr. Emer.

Weight gain is NOT a side effect of Botox. The mechanism of action of Botox doesn't have any physiologic (medical reason) connection with  weight gain. Weight gain in the United States is very likely to a combination of a non-healthy diet based on excess of calories, fast food and lack of daily exercise. Botox is an FDA approved treatment that has undergone extensive research. The FDA approved packet insert that contains the list of side effects doesn't list "weigh gain" since it is not a side effect of the product 

The weight gain you have is not from Botox. Botox doesn't affect a person's weight. Botox is great for hyperhidrosis and for correcting wrinkles. Thanks for sharing!