Is Sleep Anesthesia Really Necessary for Rejuran? Breaking Down How It Differs from Numbing Cream

Rejuran sleep anesthesia is not a method to enhance the effectiveness of the procedure. It is a method of administering an intravenous sedative to make you feel as comfortable as if you were asleep, in order to reduce injection pain and anxiety during the procedure—that is, **conscious sedation (intravenous sedation)**. It has nothing to do with Rejuran penetrating deeper or improving skin regeneration.

Therefore, the starting point of the question is this: "How much of this pain can I tolerate?" Because Rejuran involves dense injections into multiple points of the dermal layer, it is considered one of the more painful dermatological injections. Most people manage fine with just numbing cream, but if you are sensitive to pain, treating a large area, or undergoing combination treatments, you may consider sleep anesthesia. Below, we will go through the criteria one by one.

💉 What Is Rejuran and Why Does It Hurt?

The core component of Rejuran is PN (polynucleotide), or the similar concept **PDRN (polydeoxyribonucleotide)**. It is an ingredient extracted and purified from salmon testis DNA. The key point is that it is not a filler that adds volume to the skin, but a skin booster that aids skin regeneration and improves quality. Its purpose is fundamentally different.

The most widely used product is **Rejuran Healer**. The typical amount injected across the entire face per session is around 2 cc, though 4 cc or more may be used if necessary. The issue is that this ingredient is viscous and injected into a relatively shallow layer across many points. This is precisely why bumpy papules, or embossing, appear immediately after injection.

Embossing usually absorbs within several hours to 1–3 days. However, in areas with thin skin, such as around the eyes or the neck, it may last longer. The results are not immediate. They appear gradually after 2–4 weeks and accumulate with repeated sessions, so it is not a procedure to rush.

📌 Key Summary: Rejuran is a skin booster intended for regeneration, not a filler, and pain and embossing accompany it due to the nature of dense dermal injections.

😴 Sleep Anesthesia vs. Numbing Cream: What’s the Difference?

The most common pain management method for Rejuran is **numbing cream (topical anesthesia)**. It is applied 30–60 minutes prior to the procedure. Adding sleep anesthesia to this increases your stay to over 1–2 hours, including recovery time.

Sleep anesthesia commonly uses intravenous sedatives such as propofol or midazolam. Midazolam has the characteristic of leaving little memory of the procedure. What is important is that this is not general anesthesia. Even so, risks inherent to sedation itself—such as respiratory depression, drops in blood pressure, nausea, vomiting, and temporary memory impairment—certainly exist.

There are also intermediate steps between the two methods. Cooling and vibration anesthesia reduce perceived pain more than cream alone, and **nitrous oxide (laughing gas)** offers a relatively fast recovery because it is an inhalation method. Lidocaine, the main component of local anesthetics, is also an alternative.

"Sleep anesthesia is safer" is a common misconception. You simply feel less pain; in terms of safety, there are actually more parameters that need monitoring.

📌 Key Summary: Sleep anesthesia is merely one option to reduce pain, and the proper approach is to consider lighter alternatives first, such as numbing cream, cooling, or laughing gas.

🩺 Sleep Anesthesia Clinics: What Should You Check?

The moment sedatives are used, a clinic must become a "monitored space." Much more important than eliminating pain is whether they are prepared to safely supervise your recovery process as you wake up.

At a minimum, these pieces of equipment should be in place:

• Oxygen saturation, blood pressure, and pulse monitoring equipment

• Oxygen delivery equipment, suction devices, and airway management tools

• Emergency medications and a recovery area

In particular, oxygen saturation monitoring cannot be omitted, as it is the very first indicator to catch respiratory depression. As a reference, propofol is a drug managed as a psychotropic medication. This means its administration and monitoring must be handled with great caution.

📌 Key Summary: The key to choosing a clinic for sleep anesthesia is the presence of an emergency and recovery system, including oxygen saturation monitoring.

⏱️ Fasting and Guidelines for the Day of the Procedure

If you undergo sleep anesthesia, fasting is not an option—it is a rule. The standard guideline is no solid food for at least 6 hours and no clear water for up to 2 hours beforehand (this may vary slightly depending on the clinic's protocol).

On the day of the procedure, avoid the following:

• Driving yourself — You must be accompanied by a guardian

• Alcohol, strenuous exercise, and saunas

• Important contracts or decisions (judgment may be impaired)

General post-procedure care must also be observed. Alcohol, saunas, and intense exercise on the day of treatment are strictly prohibited, while sun protection and moisturizing are essential. Washing your face and applying light makeup are usually recommended starting the next day, but following the specific instructions of the clinic you visited is the most accurate approach.

📌 Key Summary: Fasting (6 hours for solids, 2 hours for water), having a guardian present, and refraining from driving on the day of treatment are basic prerequisites for sleep anesthesia.

⚠️ Who Should Approach Sleep Anesthesia with Caution?

This is not a method that can be recommended to everyone. In particular, individuals with sleep apnea require extra caution, as their airways can obstruct more easily under sedation.

If any of the following apply to you, make your decision after thorough consultation with your medical team:

• Sleep apnea, cardiopulmonary diseases

• Severe obesity, advanced age

• Past history of adverse reactions to anesthesia

• Currently taking sedatives or sleeping pills

Allergies cannot be overlooked either. Because Rejuran is a salmon-derived ingredient, you must notify the clinic in advance if you have a fish or salmon allergy. Additionally, taking aspirin, anticoagulants, omega-3, or vitamin E increases the risk of bruising. However, discontinuing anticoagulants on your own can be even more dangerous, so always coordinate any medication stoppage with your prescribing physician.

📌 Key Summary: Those with sleep apnea, cardiopulmonary conditions, or of advanced age must exercise caution, and salmon allergies as well as current medications must be disclosed in advance.

🌿 How Onlif Manages Pain

Skin boosters like Rejuran form a core pillar of the skin concerns addressed by Onlif, focusing on refining the skin barrier, hydration, and skin texture. When combined with lasers, radiofrequency (RF), or thread lifting in complex procedures, the demand for sleep anesthesia rises. What matters here is not "putting the patient to sleep no matter what," but designing a plan that minimizes the burden.

Dividing injection volumes, adjusting the sequence, and controlling the injection speed alone can significantly change the level of pain. It is about layering lighter methods first, such as numbing cream, cooling, and vibration. Stronger anesthesia is not always the better choice—that is the key takeaway.

Onlif strives for an approach where each physician handles the procedures they perform best in their respective field. Rather than altering your natural shape, we aim to calmly peel away the layers obscured by aging and fatigue to restore your innate skin texture. We approach pain management with the same philosophy.

📌 Key Summary: Combining lighter anesthetic methods and customized injection design first to reduce the need for sleep anesthesia itself is the most sensible starting point.

❓ Frequently Asked Questions (FAQ)

Do I have to get Rejuran under sleep anesthesia?

No. Most patients manage comfortably with just numbing cream. Sleep anesthesia is only considered if you are sensitive to pain, treating a large area, or combining treatments, and there are intermediate steps like cooling, vibration, and laughing gas.

Does sleep anesthesia improve the results of Rejuran?

No. Sleep anesthesia is simply a method to reduce pain and anxiety; it has no bearing on ingredient absorption or regenerative outcomes. Results appear gradually after 2–4 weeks and accumulate with repeated treatments.

Does sleep anesthesia result in less bruising or swelling?

There is no connection. Bruising is primarily influenced by medications you are taking (aspirin, anticoagulants, omega-3, vitamin E, etc.) and the injection process; when it occurs, it typically lasts 1–2 weeks.

How long should I fast? Can I drink water?

The standard protocol is to fast from solid food for at least 6 hours and clear water for up to 2 hours prior to the procedure. Protocols may vary by clinic, so please follow the specific timing provided to you.

Can I really not drive on the day of the procedure?

Yes, you cannot. Your judgment and reaction times may be impaired by the sedative, so driving yourself on the day of treatment is strictly prohibited. As a rule, you should be accompanied by a guardian and avoid alcohol or making important decisions.

When will the embossing (bumps) disappear?

They are typically absorbed within several hours to 1–3 days. In areas where the skin is thin, such as around the eyes or the neck, they may persist slightly longer.

Can I not get Rejuran if I have a salmon allergy?

Since Rejuran is a salmon-derived ingredient, you must inform your doctor in advance if you have a fish or salmon allergy. It is safer to disclose this during your consultation rather than making your own judgment.

How is Rejuran different from fillers or Mulgwang (hydro-lifting) injections?

Rejuran is not a filler designed to add volume; it is a skin booster aimed at skin regeneration and quality improvement. Its mechanism and purpose are entirely different.

Rejuran Sleep Anesthesia: What to Check Before Choosing a Clinic

Even for the same procedure, results and recovery processes vary depending on where, by whom, and how it is performed. Asking the following questions directly during your consultation will help you make an informed decision.

• Do they perform this procedure frequently? — Every clinic has its primary focus. Check whether they regularly perform Rejuran under sleep anesthesia.

• Can you verify the products and equipment used? — Inquire whether you can confirm the product name and authenticity (whether it is an officially approved import and if there is an unboxing verification process) during your consultation.

• Do they explain the breakdown of costs? — Rather than just hearing a total price, you need an explanation of which product is used, how much is administered, and across what areas to make an informed choice.

• Do they design the treatment considering the whole face? — Even for the exact same treatment, injection points and volumes vary depending on face shape, skin condition, and facial asymmetry.

• Do they explain adverse reactions and recovery first? — Clinics that inform you of potential side effects and how to handle them are much better to evaluate than those that only talk about expected improvements.

• Is there a clear follow-up channel after the procedure? — Check whether there are scheduled check-ins, a way to get in touch if issues arise, and clear criteria for follow-up visits.

How Onlif Clinic Performs Rejuran Sleep Anesthesia

• We divide responsibilities by specialization — Operating on the principle that a single doctor cannot master every procedure, Onlif assigns dedicated physicians according to their field of expertise.

• We verify products and equipment together during consultation — We guide you through the products used and the unboxing verification process during your consultation.

• Pricing is provided with a clear breakdown after assessment — Because treatment areas, dosages, and scopes differ for each person, we explain what costs what along with the diagnosis.

• We design plans considering overall facial balance — We evaluate the face along three axes—texture, balance, and signs of youth—and create plans focused on refining factors that obscure your natural expression rather than altering your features.

• We discuss adverse reactions and the recovery process upfront — Along with expected improvements, we explain individual variations, potential side effects, and coping strategies prior to treatment.

• We monitor post-procedure progress together — If follow-up checks are needed during recovery, we provide guidance on re-visiting and direct contact channels.

If you are considering Rejuran sleep anesthesia, it is best to first evaluate what is feasible and what may be challenging for your current condition. Accurate diagnosis and treatment planning can only be determined through an in-person consultation. Find out more through a consultation at Onlif Clinic in Gangnam.