Belkyra Side Effects, Recovery & Who Is a Good Candidate

If you are thinking about Belkyra for a double chin, you likely have three questions. What are the Belkyra side effects, how long is recovery, and are you a good candidate? This guide answers each one in plain words, from a medical doctor’s point of view.

For an overview of the treatment itself, see our Belkyra treatment page.

What is Belkyra (Kybella)?

Belkyra is a prescription fat dissolving injection that reduces fat under the chin. Its active ingredient is deoxycholic acid, a substance your body already makes to help break down fat from food. You may also see it called a deoxycholic acid injection.

In the United States, the same medicine is sold as Kybella, so Kybella side effects and Belkyra side effects are the same.

Belkyra treatment is a short series of small injections into the fat layer under your chin. It is non-surgical, so there are no cuts and no general anesthesia (being put to sleep). Belkyra is a prescription medication and is used only after a physician’s assessment.

A double chin can come from fat, loose skin, chin shape or a mix of these. Belkyra treats only the fat part. Our double chin page explains each cause and the options for it.

Important: In Canada, Belkyra is approved only for submental fat (the “double chin”) in adults. This article covers that use only; other areas are outside the approved indication.

How does Belkyra work?

Belkyra works by breaking the outer wall of fat cells, so they can no longer hold fat. Over the next few weeks, your body’s own clean-up cells clear the broken cells away. This is why results build slowly, and why swelling is part of normal healing.

The medicine does not only affect fat. It can harm any cell it touches, including skin, muscle and nerve cells. That is why where it goes, and how deep, matters so much.

Dr. Dan Xu and our team place each small dose inside the fat layer under the chin. We stay away from the skin surface, the neck glands and a small nerve near the jawline. Careful placement is the main way to keep side effects low.

Who is a good candidate for Belkyra?

A good candidate for Belkyra is an adult with soft fat under the chin, skin that still springs back, and a fairly stable weight. Most people we treat have mild to moderate fullness that has stayed despite diet and exercise.

You are likely a good fit if most of these are true:

• You are an adult in good general health.
• You can pinch a soft layer of fat under your chin.
• Your skin is fairly firm and does not hang in folds.
• Your weight has been steady, and you are close to your goal weight.
• You prefer injections over surgery and can accept a few days of swelling.
• You want a gradual, natural change rather than an instant one.

How Dr. Xu checks if Belkyra suits you

At your consultation, Dr. Xu feels the area to see how much of the fullness is fat and how much is skin. Dr. Xu also looks at your chin from the side, because a short chin can make the neck look fuller. We also review your health and medicines.

Who should not get Belkyra?

Belkyra is not right for everyone, and for some people it is better to wait. Do not plan Belkyra yet if any of these apply to you:

• Pregnancy or breastfeeding. We wait until you have finished both.
• An infection or sore in the area. Treatment waits until the skin has healed.
• Past trouble swallowing. Belkyra can rarely affect swallowing, so people with this history are usually not good candidates.
• Mostly loose skin with little fat. Removing fat can make loose skin look looser, so skin tightening suits you better.
• A lot of neck fat, or big weight changes ahead. Reach a steady weight first, including if you are still losing weight on a weight-loss medicine.
• Past surgery or treatment in the neck or chin. Scar tissue can change the area, so Dr. Xu checks carefully first.
• Bleeding problems or blood thinners. These raise the chance of bruising, so Dr. Xu decides with you if treatment is safe.

Because Dr. Xu is a medical doctor, your consultation also checks for neck lumps, swollen glands or a thyroid problem that can look like a double chin.

Belkyra vs other double chin treatments

Belkyra is the right choice when soft fat is the main cause of your double chin. Loose skin or chin shape needs a different treatment.

This table shows how Dr. Xu matches the cause of the fullness to a treatment.

Main cause	What you may notice	Option that usually fits
Soft fat under the chin	A soft layer you can pinch, with fairly firm skin	Belkyra
Loose skin	Skin that hangs or folds, with little fat under it	Skin tightening with an energy-based device
Short or small chin	Your profile looks full even at a healthy weight	Chin filler, sometimes together with Belkyra
A lot of fat, or fat with loose skin	Large fullness with sagging	Surgery, such as liposuction or a neck lift (we do not perform surgery)

Many people have more than one cause, and a mix of treatments then gives a more balanced result.

Belkyra for Asian faces

In our experience, many East Asian clients have a shorter chin and a softer angle between the chin and neck. Part of the double chin look then comes from chin shape, not only fat. Treating fat alone may give a smaller change than you hoped for.

Dr. Xu looks at your whole profile before suggesting a plan. For some clients, Belkyra plus a small amount of chin filler gives a more balanced jawline. A wide lower face from a strong chewing muscle is a different problem that Belkyra does not change.

Some clients also ask about fullness along the jawline and jowls. Using Belkyra there is outside the approved indication, so Dr. Xu discusses it only after a careful exam. You can read more on our page about Belkyra for the jawline and jowls.

What happens during a Belkyra treatment?

A Belkyra treatment is quick: the injections themselves usually take about 15 to 30 minutes. Here is what a typical visit looks like at our Markham clinic.

1. Dr. Xu checks the area, takes photos and confirms your plan for the day.
2. The skin is cleaned, and a small grid of dots is marked under your chin to guide each injection.
3. Ice or a numbing cream is used to make the injections more comfortable.
4. Many small injections are given into the fat with a very fine needle.
5. You rest with a cold pack for a few minutes, then go home.

Most people feel burning or stinging during the injections and for a short time after. A few people feel light-headed, as with any needle treatment, so eat a normal meal before you come.

What are the common Belkyra side effects?

The most common Belkyra side effects are swelling, bruising, tenderness, numbness, redness and firmness under the chin. Most people get some of these, and they are a normal sign that your body is clearing the treated fat. They usually fade on their own over days to a few weeks.

This table shows what each side effect feels like and how long it usually lasts.

Side effect	What it is like	How long it usually lasts
Swelling	A puffy, full chin, sometimes called a “bullfrog” look	Strongest for 2 to 3 days; mostly gone in 1 to 2 weeks
Bruising	Purple or yellow marks where the needle went in	About 1 to 2 weeks
Pain or tenderness	Soreness when you touch the area or turn your head	A few days; mild tenderness for up to 2 weeks
Numbness or tingling	The skin feels “asleep”, dull or prickly	Can last several weeks, then slowly comes back
Redness, warmth or itching	Pink, warm or itchy skin under the chin	A few hours to a few days
Firmness or small lumps	Firm or bumpy areas under the skin	Several weeks; they soften on their own
Headache	A mild headache on the day of treatment	Usually a day or less

How long does Belkyra swelling last?

Belkyra swelling is usually worst in the first 2 to 3 days, and most of it goes down within 1 to 2 weeks. Some people keep mild fullness for 3 to 4 weeks, mainly after the first session. Later sessions are often easier. The area can also feel heavy or tight when you lie down, and this is common.

Is a firm lump after Belkyra normal?

Yes. Firm areas or small lumps under the chin are common while the treated fat breaks down, and they usually soften over several weeks. Do not massage or press them unless we tell you to. Call us if a lump is very painful, red or growing.

Rare Belkyra side effects and how we keep the risk low

Serious Belkyra side effects are rare, and most get better on their own. Knowing them helps you spot them early.

• Uneven smile. A small nerve that moves the lower lip runs near the jawline. If it is irritated, your smile can look uneven for a while. This is uncommon and usually recovers on its own over several weeks.
• Trouble swallowing. Swelling in the neck can make swallowing feel hard for a short time. This is rare and usually passes within a few days.
• Skin injury. If the medicine reaches the skin or a blood vessel, a sore can form. Injecting at the right depth, into the fat, makes this rare.
• Hair loss at the treated spot. Rarely, beard hair can thin where the injections were given.
• Infection. As with any injection, infection is possible but rare.

How we keep your risk low

Dr. Dan Xu and our team follow the same safety steps at every session:

• A medical exam first, to confirm the fullness is fat and to review your health and medicines.
• A marked grid that keeps every injection in a safe zone, away from the nerve near the jawline.
• Injections placed in the fat layer, with only the amount of medicine your area needs.
• Clean technique, clear aftercare steps and a progress check before any next session.

When to call our clinic after Belkyra

Call our clinic right away if you notice any of these signs:

• Trouble swallowing
• An uneven smile or weakness in your lower lip
• Pain that gets worse, not better, after the first few days
• An open sore, a blister or skin that turns dark
• Fever, spreading redness, warmth or pus
• Hair loss in the treated area

If you ever have trouble breathing, call 911 right away.

Belkyra recovery: what to expect day by day

Belkyra recovery is short for most people. You can usually go back to work the same day or the next day, but the swelling under your chin is easy to see for several days.

This timeline shows a typical recovery after one session.

Time after treatment	What you may notice
Treatment day	Burning that fades, then swelling and tenderness start
Days 1 to 3	Swelling at its strongest, with bruising and soreness
Days 4 to 7	Swelling going down, bruises turning yellow, some numbness
Weeks 2 to 4	Most swelling gone; some numbness or firm spots may stay
Weeks 4 to 6	First visible change, and your next session if needed
About 3 months after your last session	Final result

Leave at least 2 to 4 weeks before a wedding, a trip or photos, especially for your first session. Light walking is fine, but avoid hard exercise for the first day or two.

Belkyra aftercare: before and after your treatment

Good Belkyra aftercare is simple: keep the area cool, keep your head raised, and let it heal without pressure. A little planning before your visit also helps.

Before your treatment

• Tell us about every medicine and supplement you take. Fish oil, vitamin E and ginkgo can increase bruising, and Dr. Xu tells you if and when to pause them. Never stop a prescribed medicine on your own.
• Avoid alcohol for a day or two before your visit.
• Men: shave the area the day before, not right before treatment.
• Skip strong skincare, such as retinol and scrubs, on your chin and neck for 2 days.

After your treatment

• Use a cold pack wrapped in a cloth for 10 to 15 minutes at a time, several times a day for the first 1 to 2 days.
• Sleep with your head raised on an extra pillow for the first few nights.
• Avoid saunas, hot yoga and hard exercise for the first day or two.
• Avoid alcohol and smoking for a few days, as they can increase swelling and bruising.
• Do not massage the area unless we tell you to. You can wash your face and wear makeup as usual.
• Ask us which pain reliever suits you, and whether a chin strap would help in your case.

How many Belkyra sessions will you need?

Most people need 2 to 4 Belkyra sessions, about 6 weeks apart. The exact number depends on how much fat you have and how your body responds.

The gap between sessions gives your body time to clear the treated fat and lets the swelling settle. Before each session, Dr. Xu checks your progress with you. We stop when you reach your goal, or when more sessions would add little.

How much does Belkyra cost?

Belkyra is priced by the vial, and most sessions use about 2 vials. Your total depends on how much fat you have and how many sessions you need. Our Belkyra cost guide explains current Toronto prices and what changes them.

When will you see Belkyra results, and are they permanent?

You may see the first change about 4 to 6 weeks after your first session. The full result usually shows about 3 months after your last session. Because the change is slow, before and after photos help you see your progress.

Belkyra results are long-lasting, because treated fat cells are gone and do not come back. The fat cells that remain can still grow if you gain a lot of weight. Keeping a steady weight is the simplest way to protect your result.

Does Belkyra tighten skin?

Belkyra is not a skin-tightening treatment. Some people notice the area looks a little firmer as it heals, but it will not lift loose skin. If your skin is loose, Dr. Xu may suggest skin tightening, such as RF microneedling, before or after Belkyra.

Is Belkyra worth it for your double chin?

For the right person, Belkyra is worth it: it gives a slimmer, more defined chin without surgery, and the result lasts. The trade-off is a few days of visible swelling and usually 2 to 4 visits.

The surest way to know is an exam. Dr. Dan Xu and our team can check your chin and neck at a free consultation at our Markham clinic. Learn more on our Belkyra for double chin page.