Prescription deoxycholic acid injections FDA-approved to improve moderate-to-severe submental fat in adults. It is not a general-purpose fat-dissolving injection and can injure the marginal mandibular nerve or nearby tissue.
Kybella® is prescription deoxycholic acid approved to improve the appearance of moderate-to-severe convexity or fullness associated with submental fat in adults. It disrupts cell membranes in the injected fat, producing inflammation and gradual clearance. Approval does not extend to arbitrary body areas or unbranded “fat-dissolving” mixtures.
Diagnosis before injection
Neck fullness may reflect fat, skin laxity, muscle anatomy, salivary glands, thyroid enlargement, lymph nodes, or other structures. Kybella treats selected submental fat; it does not tighten significant loose skin and can make laxity more apparent.
Expected course
Marked swelling is common after treatment and can last days to weeks. Results develop gradually and often require multiple sessions. The label permits up to a defined series, but patients should reassess benefit and anatomy before each session rather than automatically completing a package.
Key risks
Injection near the marginal mandibular nerve can cause an uneven smile or facial weakness. Dysphagia, bruising, pain, numbness, hardness, skin ulceration, necrosis, infection, and vascular injury are possible. Correct landmarking and depth are essential.
Disclose swallowing problems, neck masses or thyroid disease, facial nerve weakness, infection, bleeding risk, prior neck surgery or liposuction, previous injectables, pregnancy or breastfeeding, and all medications.
Swelling, bruising, pain, numbness, redness, and firmness are common and may be conspicuous. Seek prompt care for an uneven smile, facial weakness, trouble swallowing, open sores, drainage, severe pain, or skin discoloration.
Swelling, bruising, pain, numbness, redness, hardness, headache, and contour irregularity. Serious risks include marginal mandibular nerve injury with asymmetric smile, dysphagia, ulceration, necrosis, infection, vascular injury, and tissue damage from incorrect placement.
FDA Prescribing Information: Kybella (deoxycholic acid).
https://www.accessdata.fda.gov/drugsatfda_docs/label/2020/206333s002lbl.pdfFDA Drugs@FDA: Kybella Application 206333.
https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=206333© 2026 Longevity Clinic Finder. All rights reserved.
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Adults with moderate-to-severe submental fat and suitable skin and neck anatomy who accept swelling and a possible series. Not appropriate for unexplained neck fullness, active infection, or goals better addressed by laxity treatment or surgery.
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