BHRC BLOG
Kybella in Westlake Village — Submental Fat, Cost, Sessions and the Real Trial Numbers
Kybella · Westlake Village & Conejo Valley
From $750, genuinely FDA-approved, and honest about what the trials found: most responders got one grade of improvement, and nearly everyone swelled.
1. What it is and how it works
Kybella is deoxycholic acid, a naturally occurring bile acid whose job in your body is solubilising dietary fat. Injected into subcutaneous fat, it does the same thing there: it disrupts the adipocyte cell membrane — a process called adipocytolysis — killing the fat cell outright.
That releases the cell’s contents and triggers a local inflammatory response, after which macrophages clear the debris and the fibrous septa thicken. The inflammatory phase is why swelling is universal and prolonged. It is not a side effect of poor technique; it is the mechanism working.
Protein-rich tissue — skin, muscle, nerve — is comparatively more resistant, which is why precise subcutaneous placement matters so much. Injection that is too superficial, into the dermis, causes ulceration and necrosis.
2. What the pivotal trials actually found
Kybella was approved in April 2015 on the strength of two multicentre, randomized, double-blind, placebo-controlled phase 3 trials — REFINE-1 and REFINE-2 — enrolling 514 patients on Kybella against 508 on placebo, with up to six treatments at least a month apart.
One more number from the trials that tells you something: only 59% completed all six treatments. That is worth knowing when you are being quoted a six-session plan.
On durability, a three-year follow-up of REFINE responders found improvement maintained in 82–91% of Kybella responders versus 57–74% of placebo responders across years one to three — and found no meaningful correlation between the number of treatments and durability among responders. More sessions did not mean a longer-lasting result.
3. The safety numbers from the label
Two labelled warnings deserve a paragraph each rather than a footnote.
Marginal mandibular nerve injury — 4% (20 of 513 patients). It presents as an asymmetric smile or facial muscle weakness. Every case in the trials resolved spontaneously, with a range of 1 to 298 days and a median of 44 days. That median is six weeks; that range extends to nearly ten months.
Dysphagia — 2% (10 of 513). Difficulty swallowing. All cases resolved spontaneously, range 1 to 81 days, median 3 days.
The label also warns about injection-site alopecia, which may persist; ulceration and necrosis from injection that is too superficial; and injury to vulnerable structures including salivary glands, lymph nodes, arteries and veins. Given the 72% bruising rate, anticoagulants warrant a conversation.
4. The swelling timeline — plan your calendar around this
5. Who is a candidate — and who is not
That first point on the right is worth expanding. If your submental fullness is mostly skin laxity rather than fat, dissolving the fat underneath can make the area look worse — it removes the volume that was holding loose skin taut. In that situation a tightening modality such as Ultherapy or Morpheus8 is the more useful conversation, sometimes on its own and sometimes before any fat reduction.
The only labelled contraindication is infection at the injection sites. The rest of that list is clinical judgement — but it is judgement based on how this product behaves, and an assessment that skips it is not an assessment.
6. What it costs at Westlake Village
| What you book | Price |
|---|---|
| One treatment | from $750 |
| Two treatments | from $1,400 |
| Three treatments | from $2,000 |
Rejuvenation Club members save 20% on every treatment plus priority scheduling. In practice most patients need two to four sessions; the label ceiling is six, at a minimum of one month apart, with a maximum of 50 injections of 0.2 mL (10 mL total) per session. Our Westlake Village clinic serves Thousand Oaks, Agoura Hills, Calabasas, Newbury Park, Oak Park and Encino.
968 S Westlake Blvd, Ste 10, Westlake Village, CA 91361
(805) 374-2472 · Monday–Friday 9:00 AM – 6:00 PM, Saturday 9:00 AM – 5:00 PM
the Westlake Village clinical team
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Consultations are free and carry no obligation.
7. Kybella or CoolSculpting for a double chin?
Both are options for submental fat and they behave differently. CoolSculpting is cleared for the submental and submandibular areas up to a BMI of 46.2, is non-invasive, and has its own delayed complication — paradoxical adipose hyperplasia — to weigh. Kybella is injected, is FDA-approved specifically for this indication, and has a swelling course that CoolSculpting does not.
The practical differences: Kybella can be placed precisely in a small or awkwardly shaped pocket that an applicator cannot cup. CoolSculpting covers a broader area in one sitting with far less post-treatment swelling. Neither addresses laxity. Which one suits you is an in-person question about the shape and composition of what is actually under your chin.
8. What the treatment itself is like
People are often surprised by the mechanics, so here is what actually happens. A grid is marked on the treatment area — the space between the jawline and the hyoid bone, avoiding the marginal mandibular nerve’s territory. Topical anaesthetic and ice are typical. Then up to fifty separate injections of 0.2 mL each are placed about a centimetre apart across the grid.
The injections themselves take roughly fifteen to twenty minutes. The burning sensation starts within a minute or two and is genuinely uncomfortable for the first several minutes — most people describe it as intense heat rather than sharp pain. It fades to an ache. Then the area begins to swell, and by that evening it will look noticeably fuller than when you arrived. That is expected and it is not a complication.
Practical things worth doing: bring a scarf or a high collar for the trip home, plan to be unremarkable-looking for at least a week, avoid anticoagulants and alcohol beforehand if your prescriber agrees, and take the photographs your provider offers. The change is gradual enough across three or four sessions that most people lose their own reference point entirely.
Questions we get asked
How much does Kybella cost?
At BHRC Westlake Village, from $750 for one treatment, $1,400 for two and $2,000 for three. Most people need two to four; the label permits up to six, at least a month apart.
How much of a difference will it make?
In the pivotal trials, 66–70% of patients achieved a one-grade improvement and 13–19% achieved two grades. A one-grade change is real and worthwhile. Expecting a surgical result from an injectable is where disappointment comes from.
How bad is the swelling?
Eighty-seven percent of patients experience it, and about 20% still have some oedema past 30 days. Peak is the first few days. Do not schedule a treatment within a month of an event.
Is the numbness permanent?
Numbness affected 66% of patients in the trials and resolves. Separately, marginal mandibular nerve injury — an asymmetric smile — occurred in 4%; all cases resolved spontaneously, median 44 days, range 1 to 298 days.
Is Kybella FDA-approved or FDA-cleared?
Genuinely approved — it is a drug, approved 29 April 2015 under NDA 206333 for improvement in the appearance of moderate to severe convexity or fullness associated with submental fat in adults. Most body-contouring devices are cleared, not approved. This one is the exception.
Does the fat come back?
The treated fat cells are destroyed. A three-year follow-up of trial responders found improvement maintained in 82–91% of them. Significant weight gain can still change the area, because the remaining fat cells enlarge.
Keep reading
- Kybella at BHRC Westlake Village
- CoolSculpting Elite — the non-invasive alternative
- Morpheus8 at BHRC Westlake Village — for laxity
- Ultherapy — lifting lax submental and neck tissue
- Emsculpt NEO — body contouring with a muscle component
- The Rejuvenation Club — 20% off every treatment
Book at any of our six locations
References
- U.S. Food and Drug Administration — NDA 206333 approval letter — Kybella (deoxycholic acid) injection, 29 April 2015. accessdata.fda.gov
- U.S. Food and Drug Administration — Kybella (deoxycholic acid) injection — full prescribing information, including REFINE trial results and adverse reaction rates. accessdata.fda.gov
- Aesthetic Surgery Journal (2021) — Improvements in submental contour up to 3 years after ATX-101: efficacy and safety follow-up of the phase 3 REFINE trials. 2021;41(11):NP1532. academic.oup.com
- U.S. Food and Drug Administration — 510(k) summary — CoolSculpting Elite (K212707), including the cleared submental and submandibular indication. accessdata.fda.gov
- Kelly E, et al. — Multicenter evaluation of paradoxical adipose hyperplasia following cryolipolysis: 8,658 cycles in 2,114 patients. Aesthetic Surgery Journal 2021;41(8):932. academic.oup.com
Beverly Hills Rejuvenation Center. This content is for general education and does not create a physician-patient relationship or constitute medical advice. Kybella is FDA-approved for improvement in the appearance of moderate to severe convexity or fullness associated with submental fat in adults. Use in other areas is off-label. Marginal mandibular nerve injury and dysphagia are labelled risks. Candidacy, dosing, results and pricing vary by person and are confirmed at a free consultation. Reviewed by the BHRC clinical team.
