What is the largest amount of ml's you can get in one sitting of Kybella?

Using too much Kybella can result in the ‘bullfrog effect” that occurs from swelling. In the study we did not administer more than 5 vials per treatment, but in clinical practice I usually administer between 2 to 4 vials per treatment — about 4 to 8 mL. Most people need two or three treatments, with about two  or three months  between sessions. Kybella can give you a beautifully defined chin and jawline without surgery. Other nonsurgical options are CoolMini and ThermiTIght. Consulting a board-certified dermatologist will let you explore your options in more detail and choose the therapy to get you the results you want.

thankyou for your question.
 The maximum dose in one sitting is 10mls . this is equivalent to 5 vials. This isn't common at all though. In the studies 3-4 vials were used.  the more vials you use the more expensive it is.
 Belkyra is only approved for the double chin. What this means is a more defined chin and jaw line.
A minimum of 2 treatments is required but many people require more . 
If you are an appropriate candidate the treatment does work.

I hope this helps and good luck