The dangers of Botox: real risks, side effects, and who shouldn't get it

In everyday speech, Botox often refers to any injection of botulinum toxin, although strictly medically, Botox and Botox Cosmetic are specific preparations of onabotulinumtoxin type A. They work by temporarily blocking the release of acetylcholine at the neuromuscular junction, causing the targeted muscle to contract less strongly. Therefore, the potential harm of Botox is not due to "skin destruction," but to its medicinal effects on muscles, glands, and nerve transmission. [1]

It's important not to confuse proven risks with myths. Botox is not a filler, it doesn't "puff up" the face, and it doesn't accumulate in the skin as a permanent substance. However, it is a prescription drug, not a regular cosmetic procedure: if the dosage is incorrect, the injection site is incorrect, the product is counterfeit, sterility is compromised, or the patient is unsuitable, it can indeed cause harm. [2]

There are three levels of Botox-related harm: local reactions from the injection itself, local functional complications due to unwanted relaxation of adjacent muscles, and rare systemic reactions, when the toxin's effect extends beyond the injection site. Local reactions are usually mild and temporary, while systemic symptoms are rare but require immediate medical evaluation. [3]

The American Academy of Dermatology notes that most mild side effects from botulinum toxin are related to the injection itself, not the toxin itself: swelling, redness, soreness, bruising, and sometimes a mild headache are possible. These are unpleasant, but usually harmless, and resolve on their own. [4]

But the opposite error is to consider Botox "absolutely harmless." The official instructions for Botox Cosmetic warn of the toxin's potential for spreading effects: symptoms may include weakness, double vision, drooping eyelids, and difficulty swallowing, speaking, and breathing. These complications are rare when used correctly for cosmetic purposes at the prescribed doses, but they are what determine the medical seriousness of the procedure. [5]

Type of risk	How does it manifest itself?	How dangerous is it?
A common local reaction	Redness, bruising, soreness, slight swelling	Usually temporary and harmless
Local complication	Eyelid ptosis, drooping eyebrows, smile asymmetry	Usually temporary, but may interfere with vision and appearance
Allergic reaction	Rash, itching, hives, wheezing, dizziness	It may be an emergency
Systemic effect	Weakness, double vision, difficulty speaking, swallowing, or breathing	Requires urgent medical attention
Risk of counterfeiting	Unpredictable dose, contamination, botulism-like symptoms	Potentially life-threatening

Source for the table: official instructions for Botox Cosmetic, materials of the American Academy of Dermatology and StatPearls clinical review on botulinum toxin. [6] [7] [8]

Common side effects include bruising, pain, swelling, and headache.

The most common adverse effects after Botox are reactions at the injection site. The skin is punctured with a needle, so localized redness, swelling, soreness, a feeling of pressure, small bumps, and bruising may occur. These reactions are generally not indicative of toxic damage to the body, but are similar to reactions after other injections. [9]

A bruise occurs when the needle pierces a small vessel. The risk is higher in people with thin skin, a tendency to bruise, or those taking anticoagulants, antiplatelet agents, or certain anti-inflammatory medications. Avoid discontinuing prescribed medications on your own, as the risk of thrombosis or a cardiovascular event can be much more serious than a cosmetic bruise. [10]

Headaches after Botox are possible, especially after injections to the upper third of the face. The Mayo Clinic lists headaches and flu-like symptoms among possible side effects. This is usually temporary, but if the headache is severe, unusual, or accompanied by double vision, weakness, slurred speech, numbness, or blurred vision, it should not be considered a normal consequence of the cosmetic procedure. [11]

Swelling and redness usually subside within the first few hours or days. They can be aggravated by alcohol, overheating, vigorous exercise, saunas, facial massage, and vigorous rubbing of the skin immediately after the procedure. Therefore, after injections, it is generally recommended to avoid rubbing the treated area or massaging the face, and to allow the skin to recover. [12]

The danger of common reactions is that patients sometimes miss the onset of complications, considering everything "normal." If the pain intensifies, the skin becomes hot, pus appears, the redness increases, fever develops, or the swelling becomes markedly asymmetrical, this is no longer a typical bruise or the usual soreness after a needle injection. In such a situation, a doctor's examination is necessary. [13]

Symptom	A common cause	What to usually do
A small bruise	Small vessel injury	Observe, do not heat actively, do not massage
Mild soreness	Reaction to the injection	Discuss acceptable pain relief with your doctor.
Redness	Local vascular reaction	Usually goes away on its own
Minor swelling	Skin reaction to puncture and drug	Do not rub or overheat
Severe increasing pain	Possible inflammation, infection or other complication	Contact a doctor

Source for table: American Academy of Dermatology, Mayo Clinic, and StatPearls review of botulinum toxin. [14] [15] [16]

Local damage: ptosis, asymmetry, “heavy eyebrows” and unnatural facial expressions

The most common cosmetic complications of Botox are related to the drug relaxing the wrong muscle, relaxing the right muscle too much, or partially spreading into an adjacent area. This can result in a drooping upper eyelid, drooping eyebrows, an asymmetrical smile, a heavy forehead, or a "frozen" facial expression. This isn't always life-threatening, but it can be psychologically distressing and functionally unpleasant. [17]

Upper eyelid ptosis occurs when the muscle that lifts the upper eyelid weakens or the delicate balance of muscles around the eye is disrupted. Botox Cosmetic instructions list eyelid ptosis among the side effects of brow shaping and other facial treatments. This effect is usually temporary but can interfere with vision, reading, driving, and computer use. [18]

Drooping eyebrows are often associated with over-relaxation of the frontalis muscle. The frontalis muscle lifts the eyebrows, and in some people, it compensates for age-related drooping of the upper eyelids. If it is too weak or too weak, the face can appear tired and the upper eyelids heavy. Therefore, forehead injections require a particularly precise assessment of the anatomy. [19]

An asymmetrical smile, difficulty pronouncing certain sounds, drooling, or changes in facial expressions can occur when there is an undesirable effect on the muscles around the mouth. This is most often due to technique, dosage, anatomical features, or attempting to correct areas where functional muscles are located very close to each other. The Mayo Clinic lists a crooked smile and drooling as possible side effects of Botox. [20]

The main problem with such complications is the lack of an immediate "antidote" for the toxin once it has taken effect. A doctor can partially alleviate some conditions, for example, prescribing eye drops for eyelid ptosis, but the effect of botulinum toxin itself wears off gradually. Therefore, prevention—precise technique, moderate dosage, and proper patient selection—is far more important than attempting to correct errors after the procedure. [21]

Local complication	Possible mechanism	What is important
Drooping of the upper eyelid	Undesirable effects on the muscle that lifts the eyelid	An examination is necessary, especially if your vision is affected.
Drooping eyebrow	Too much relaxation of the frontalis muscle	Often temporary, but aesthetically noticeable
Smile asymmetry	Effect on the muscles around the mouth	May interfere with speech and eating
"Frozen" face	Overdose or too wide a zone	Not dangerous in itself, but looks unnatural
Dry or watery eyes	Changes in the functioning of the muscles around the eyes	Requires evaluation if symptoms are severe

Source for the table: official instructions for Botox Cosmetic, materials from Mayo Clinic and clinical review by StatPearls. [22] [23] [24]

Rare but serious risks: toxin spread, ingestion, breathing, and systemic weakness

The most serious potential harm from Botox is the spread of the toxin's effects beyond the injection site. The official instructions for Botox and Botox Cosmetic warn that symptoms may appear hours or weeks after the procedure. These include generalized weakness, double vision, drooping eyelids, speech impairment, difficulty swallowing, and difficulty breathing. [25]

When used cosmetically at approved doses, serious systemic events are considered rare but should not be ignored. The risk is higher with counterfeit products, excessive doses, improper dilution, administration to inappropriate areas, self-injection, procedures performed in non-medical settings, and in people with underlying neuromuscular disorders. [26]

Swallowing difficulties are particularly dangerous because they can lead to choking, aspiration, and breathing problems. In clinical practice, for example, when injecting into the neck muscles for cervical dystonia, swallowing difficulty is a known adverse effect. This demonstrates that harm depends not only on the drug but also on the injection site. [27]

Difficulty breathing, neck weakness, double vision, slurred speech, difficulty swallowing, or rapidly worsening general weakness are not symptoms to be left at home. They require immediate medical attention, especially if they occur after injections of an unknown drug, an at-home treatment, a spa treatment, or in someone without confirmed medical qualifications. [28]

Allergic reactions should be kept in mind. The Botox manufacturer notes that serious and immediate allergic reactions have been reported, including itching, rash, red, itchy blisters, wheezing, asthma-like symptoms, dizziness, and fainting. Such symptoms require immediate medical attention, and further botulinum toxin injections should be discontinued until evaluated by a physician. [29]

An alarming symptom	Why is it dangerous?	Action
It's hard to breathe	Possible serious spread of toxin effect or allergy	Urgent medical care
It's hard to swallow	Risk of aspiration and malnutrition	Urgent medical care
Double vision	Possible involvement of the oculomotor muscles	See a doctor immediately
Slurred speech	Possible systemic effects of the toxin	See a doctor immediately
Severe general weakness	Possible botulism-like condition	Urgent medical care
Hives, wheezing, fainting	Possible allergic reaction	Immediate assistance

Source for table: official Botox Cosmetic instructions, warning from the US Centers for Disease Control and Prevention, and manufacturer's information on serious allergic reactions. [30] [31] [32]

Who might be particularly at risk from Botox?

Botox can be particularly risky for people with neuromuscular diseases because they have underlying problems with signal transmission between the nerve and muscle. Clinical reviews cite myasthenia gravis, amyotrophic lateral sclerosis, myopathies, and other conditions in which additional muscle weakening can be dangerous as important contraindications or high-risk situations. [33]

Pregnancy and breastfeeding are also generally considered situations where cosmetic botulinum toxin injections should be postponed. This is not due to the proven high harm in each case, but rather to the lack of need to take risks for an optional aesthetic procedure given the limited safety data available for these groups. [34]

Botox is contraindicated in cases of infection at the intended injection site. If the treatment area contains pustules, active herpes, inflammatory rashes, damaged skin, severe dermatitis, or signs of a bacterial infection, the injection may increase the risk of spreading the inflammation and complicate recovery. [35]

Caution is required for patients taking aminoglycoside antibiotics, muscle relaxants, and other medications that affect neuromuscular transmission. The official Botox instructions warn that such medications may enhance the effects of botulinum toxin. Therefore, the doctor needs to be aware not only of cosmetic procedures but also of all medications the patient is taking. [36]

Another risk group includes people with severe appearance anxiety, unrealistic expectations, or body dysmorphic disorder. In such cases, even a technically successful result can be perceived as a disaster, and the patient may require repeated corrections, increasing the risk of overdose, asymmetry, and psychological deterioration. A StatPearls review lists body dysmorphic disorder as a contraindication to botulinum toxin. [37]

Group or state	Why is the risk higher?
Myasthenia gravis and other neuromuscular diseases	Excessive muscle weakness may occur.
Pregnancy and breastfeeding	It is better to postpone the cosmetic procedure due to limited data
Infection at the injection site	Risk of worsening inflammation and complications
Taking medications that affect neuromuscular transmission	Possible enhancement of the toxin's effect
Allergy to the components of the drug	Risk of recurrent allergic reaction
Body dysmorphic disorder	High risk of dissatisfaction and excessive procedures

Source for table: Official Botox leaflet, Botox Cosmetic instructions, and StatPearls review of contraindications and drug interactions. [38] [39] [40]

Fake Botox, home injections and procedures by unqualified people

One of the most real modern sources of harm is not registered Botox, but counterfeit, improperly stored, improperly diluted, or illegally sold products. In 2024, the US Centers for Disease Control and Prevention investigated adverse reactions following injections of counterfeit or improperly used botulinum toxin, and the resulting data showed that such cases did indeed result in illness. [41]

A 2024 alert from the U.S. Centers for Disease Control and Prevention reported adverse effects in patients after injections of counterfeit toxin or procedures performed by people without following local guidelines. Symptoms included blurred vision, drooping eyelids, dry mouth, slurred speech, shortness of breath, fatigue, and generalized weakness.[42]

In 2025, the US Food and Drug Administration issued warnings to the owners of 18 websites that were illegally selling unapproved and mislabeled botulinum toxin products. The agency noted that it was aware of adverse events associated with such products, including symptoms of botulism. [43]

Home injections and so-called "Botox parties" are particularly dangerous because they often lack sterility, medical examination, proper dilution of the drug, anatomical markings, immediate assistance, and product authenticity control. Even if a person "knows how to inject," this is no substitute for medical training and responsibility for complications. [44]

A low price should raise concerns if there is no clear explanation of the drug used, its supplier, how it was stored, and whether the specialist is authorized to perform the injections. Patients have the right to request to see the packaging, the name of the active ingredient, the expiration date, the batch number, and to ensure that the procedure is performed in a medically safe environment. [45]

Dangerous scenario	What is the risk?
The drug was purchased online	May be counterfeit, contaminated or incorrectly dosed
Injections at home	No sterility control or emergency care
A procedure performed on a person without medical qualifications	Errors in anatomy, dosage and technique
Unknown origin of the drug	It is impossible to assess the safety and authenticity
The price is too low	May indicate a counterfeit or illegal product
Repeated injections without taking into account the previous dose	Risk of excessive weakness and complications

Source for table: US Centers for Disease Control and Prevention and US Food and Drug Administration warnings about counterfeit and illegally sold botulinum toxin products. [46] [47] [48]

Frequent injections, addiction and loss of effect

One of the much-discussed downsides of Botox is the potential loss of effectiveness with repeated treatments. Sometimes this isn't due to immune issues, but rather technical reasons: incorrect dosage, incorrect muscle selection, excessively long waiting times, changes in facial expressions, or the use of a different product with incompatible units. Therefore, "Botox has stopped working" doesn't always mean antibody formation. [49]

An immunological cause is also possible: the body may produce neutralizing antibodies to botulinum toxin, making the drug less effective. A 2024 review indicates that the immunogenicity of botulinum toxin type A varies across clinical settings, and repeated injections may be a factor in antibody formation. [50]

The risk of developing neutralizing antibodies in aesthetic practice is generally considered low because lower doses are used than in many treatment regimens. However, the risk may increase with high total doses, excessively frequent repetitions, unnecessary "top-ups," and the use of products of unknown quality. Therefore, a reasonable interval and moderate dose are not only a matter of aesthetics but also a matter of maintaining treatment effectiveness. [51]

Another downside of frequent treatments is the potential for excessive muscle weakening and altered facial expressions. If you constantly try to completely turn off the forehead, the area between the eyebrows, or the muscles around the eyes, your face may look less natural, and nearby muscles may begin to overexert themselves in compensation. This isn't "poisoning," but it can cause real aesthetic harm if the strategy is incorrect. [52]

It's important to remember that units of different botulinum toxin preparations cannot be converted to each other like milligrams of the same substance. The official Botox Cosmetic instructions clearly state that activity units are specific to the preparation and assay method, so changing brands requires a professional dosage review, not a mechanical recalculation. [53]

Problem with frequent use	Possible cause	How to reduce the risk
The effect has become weaker	Technique, dose, wrong muscle or antibodies	Assessment by an experienced doctor
The effect doesn't last long.	Individual reaction or insufficient scheme	Do not increase the dose on your own.
The face looks unnatural	Excessive muscle relaxation	Use in moderation
A new asymmetry has emerged	Compensation of adjacent muscles	Do not make frequent chaotic adjustments
Different drugs produce different effects.	The units are not interchangeable.	Do not compare doses directly

Source for the table: official Botox Cosmetic instructions, review of the immunogenicity of botulinum toxin, and review of secondary loss of response. FDA [54] [55]

How to reduce harm: rules for choosing a safe procedure

The first rule of safety is to have injections administered only by a medically trained professional with training in anatomy and the ability to handle prescription medications. The American Academy of Dermatology emphasizes that botulinum toxin should be administered by a properly trained medical professional, not by a random person in a non-medical setting. [56]

The second rule is to honestly inform your doctor about all medical conditions, medications, past complications, allergies, pregnancy, breastfeeding, facial surgeries, and neurological diagnoses. Botox should not be prescribed on a "one-size-fits-all" basis, because the same regimen may be safe for one patient and unsuccessful for another. [57]

The third rule is to start with a moderate dose and a clear goal. It's safer to soften excessive facial expressions and allow natural movement than to completely shut down the muscles. This is especially important for people with low eyebrows, heavy upper eyelids, facial asymmetry, and active forehead compensation. [58]

The fourth rule is to follow proper aftercare. The Mayo Clinic recommends avoiding massage of the treated areas for 24 hours and not lying down for 2-4 hours after injections to reduce the risk of spreading the toxin to the unwanted area. The American Academy of Dermatology also advises avoiding rubbing or massaging the treated area and waiting before engaging in intense physical activity. [59] [60]

The fifth rule is to avoid having the procedure done right before an important event. Even with proper technique, bruising, swelling, temporary asymmetry, or headaches are possible. Furthermore, the effect doesn't appear immediately: according to the Mayo Clinic, the first changes usually appear within 1-3 days, while full results may take 1 week or more. [61]

Rule	Why is it needed?
Check the doctor's qualifications	Reduce the risk of dose and anatomical errors
Specify the name of the drug	Eliminate counterfeit and unknown products
Report illnesses and medications	Assess contraindications and interactions
Don't chase a complete "freeze"	Maintain natural facial expressions and reduce the risk of ptosis
Observe aftercare	Reduce the risk of drug spread
Plan the procedure in advance	Avoid bruises or asymmetry before the event

Source for table: Safety recommendations based on materials from the American Academy of Dermatology, Mayo Clinic, Botox Cosmetic instructions, and a StatPearls review. [62] [63] [64] [65]

Frequently asked questions

Is Botox harmful to the body? When used correctly as a registered drug in a medical setting, Botox is generally considered a controlled procedure with predictable risks, but it is not a harmless cosmetic. Local reactions, ptosis, asymmetry, allergies, and rare systemic symptoms are possible, so the procedure should be performed by a qualified professional. [66]

Can Botox cause permanent facial paralysis? The typical effect of botulinum toxin is temporary, as neuromuscular transmission gradually recovers. However, temporary excessive muscle relaxation can be severe and unpleasant, especially if the dose or area is incorrect, or if an unknown product is used. [67]

Do eyelids droop after Botox? Yes, upper eyelid ptosis and brow drooping are known potential complications. These are usually temporary, but if the eyelid covers the pupil, interferes with vision, or is accompanied by double vision, a doctor's examination is necessary. (FDA)

Can you die from Botox? While this is extremely rare when used legally for cosmetic purposes in the correct doses, botulinum toxin can potentially impair breathing and swallowing if its effects spread systemically or if the product is counterfeit or improperly administered. Therefore, symptoms such as shortness of breath, weakness, slurred speech, and difficulty swallowing require immediate medical attention. [68]

What are the most dangerous things about Botox? The most dangerous factors are counterfeit products, unsterile conditions, lack of medical qualifications, excessive dosage, self-injection, and ignoring contraindications. Warnings from the U.S. Centers for Disease Control and Prevention and the U.S. Food and Drug Administration are directly related to counterfeit and illegally sold products. [69] [70]

Can Botox be used for migraines? Botox is used to prevent headaches in adults with chronic migraines, but this is a treatment regimen with different doses and injection sites, not a cosmetic procedure. For episodic migraines, the safety and efficacy of Botox have not been established. [71]

Can Botox stop working? Yes, it's possible, but the reasons vary: improper technique, insufficient dosage, the wrong muscle, too high expectations, or the rare formation of neutralizing antibodies. Repeated, frequent injections and high doses can increase the risk of immunological loss of effect. [72]

Is Botox safe for pregnant women? Cosmetic botulinum toxin injections are generally best postponed during pregnancy. It is not an emergency procedure, and there is insufficient safety data during pregnancy and breastfeeding to justify the unnecessary risk. [73]

What should you do if you experience difficulty swallowing or breathing after Botox? You should seek immediate medical attention. These symptoms may indicate the spread of the toxin's effects or a botulism-like condition, especially if the procedure was performed with an unknown substance or outside of a medical setting. [74] [75]

How can you tell if a product is genuine? Patients have the right to ask about the name of the product, the active ingredient, the expiration date, the batch number, the source of supply, and the specialist's qualifications. The U.S. Food and Drug Administration has warned about counterfeit versions of Botox and illegally sold botulinum products, so transparency of product origin is essential. [76]

Key points from experts

Rebecca Small, MD, associate clinical professor, Department of Family and Community Medicine, University of California San Francisco School of Medicine, author of the American Family Physician review of botulinum toxin for facial wrinkles. Her practical thesis: botulinum toxin for aesthetics should be viewed as a medical injection procedure with anatomical markings, informed consent, contraindications, and potential complications, rather than as a household cosmetic procedure. [77]

Inderbir S. Padda, MD, and Prasanna Tadi, MD, authors of the StatPearls clinical review on botulinum toxin. Their key finding: the safety of botulinum toxin depends on proper patient selection, knowledge of contraindications, understanding of drug interactions, and alertness to recognize serious symptoms, including systemic weakness and difficulty breathing or swallowing. [78]

Mitchell F. Brin, MD, Senior Vice President, Research and Development and Chief Scientific Officer, Botox and Neurotoxins, AbbVie. His scientific contributions relate to the development of botulinum toxin as a medicinal tool: an important message for patients is that a drug can be effective and safe only with controlled production, correct dosage, medical use, and compliance with the indications. [79] [80]

Jean Carruthers, MD, FRCSC, clinical professor of ophthalmology at the University of British Columbia, is a pioneer in the cosmetic use of botulinum toxin. Her experience shows that the aesthetic use of botulinum toxin grew out of ophthalmological practice, where precision of muscle, dosage, and anatomy were critical; this principle remains central to the prevention of ptosis and asymmetry. [81]

Alastair Carruthers, MD, a dermatologist, is one of the pioneers of the cosmetic use of botulinum toxin type A. His contributions to the development of aesthetic use of botulinum toxin emphasize that good results depend not on the “strength of the drug,” but on clinical judgment: the right patient, the right muscle, the right dose, and an honest discussion of the risks. [82]