What is botulinum toxin and what is it used for?
Botulinum toxin type A is a highly active protein that temporarily inhibits the transmission of signals between nerves and muscles. It has been used in medicine for decades in very small, precisely dosed amounts – for example, to treat:
- expression lines (e.g. frown lines, forehead lines, crow's feet)
- chronic migraine
- excessive sweating (hyperhidrosis)
- muscle tension and certain neurological conditions such as spasticity or dystonia
- teeth grinding (bruxism)
Despite its broad use and many years of experience, it is important to be aware of possible risks. The following provides an overview of botulinum toxin side effects, botulinum toxin risks and aspects of safety in wrinkle treatment.
How safe is treatment with botulinum toxin?
When used appropriately by medically trained personnel, botulinum toxin is considered a well-studied active substance. Studies and decades of clinical experience show that serious side effects are rare when the following conditions are met:
- thorough consultation and medical history
- correct indication
- precise dosing and injection technique
- use of approved preparations
- consideration of individual contraindications
Nevertheless, botulinum toxin is a prescription medicine with pharmacological effects – and therefore not a "lifestyle product".
Possible side effects at a glance
Side effects usually occur locally at the injection site and are generally temporary. They depend, among other things, on the area treated, the dose, and individual response.
Common, usually harmless side effects
- mild redness, swelling or small bruises at the injection site
- tenderness or temporary itching
- headaches in the first days after treatment
- a feeling of tension or heaviness in the treated area
These symptoms usually subside on their own within a few hours to days.
Less common side effects
- temporary asymmetry of facial expression
- drooping eyelid (ptosis) or altered eyebrow position
- double vision or dry eyes with treatments in the eye area
- difficulty swallowing with injections in the neck area (e.g. for neurological indications)
- flu-like symptoms, fatigue
- with underarm treatment: increased sweating in other areas of the body
Such effects are generally reversible, as the action of botulinum toxin wears off after a few weeks to months.
Very rare, serious side effects
- pronounced allergic reactions
- unintended effect on adjacent muscle groups
- in isolated cases, breathing or swallowing difficulties, particularly with higher doses used in medical applications
If shortness of breath, pronounced swallowing difficulties or persistent vision problems occur, medical help should be sought immediately.
Who should avoid botulinum toxin? Contraindications
Treatment with botulinum toxin is not suitable for everyone. The most important contraindications include:
- pregnancy and breastfeeding
- known hypersensitivity to botulinum toxin or to components of the preparation
- certain neuromuscular disorders (e.g. myasthenia gravis, Lambert-Eaton syndrome, ALS)
- acute infections or inflammation in the treatment area
- blood clotting disorders or use of strong blood-thinning medication (individual assessment required)
Certain medicines – for example some antibiotics or muscle relaxants – can also influence the action of botulinum toxin. An honest and complete medication history is therefore important.
Interactions and special precautions
The following points should be discussed before treatment:
- existing pre-existing conditions, especially neurological ones
- regularly taken medicines, food supplements and herbal preparations
- previous reactions to botulinum toxin
- planned surgical procedures in the treatment area
How can risks be minimised?
The safety of a botulinum toxin treatment depends largely on the qualification of the treating doctor and on individual preparation. The following points contribute to a low-risk course of treatment:
Before the treatment
- medical consultation with detailed history-taking
- realistic expectations and clear goals
- avoiding blood-thinning substances such as alcohol or certain painkillers in the days before treatment – after consultation
- information about all medicines being taken
During the treatment
- application exclusively by medically trained personnel
- use of approved, originally packaged preparations
- hygienic conditions and correct injection technique
After the treatment
- do not rub, press or massage in the first few hours
- avoid sport, sauna and intense heat on the day of treatment
- keep the head as upright as possible in the first few hours
- contact the treating practice promptly if any unusual symptoms occur
Myths and misunderstandings
A number of assumptions persist around botulinum toxin that need to be put into perspective:
- "Botulinum toxin is a poison and therefore dangerous." The active substance is indeed derived from a bacterial toxin, but in medicine it is used in highly diluted, precisely dosed form.
- "The substance accumulates in the body." According to current knowledge, the active substance is broken down by the body; the effect wears off after a few months.
- "Once treated, facial expression is permanently restricted." The effect is reversible. With correct dosing, natural facial expression is generally preserved.
When should you seek medical advice?
Prompt contact with the treating practice is recommended if the following symptoms occur after treatment:
- pronounced or persistent asymmetry
- visual disturbances or a drooping eyelid lasting several weeks
- difficulty swallowing or breathing
- signs of an allergic reaction (skin rash, shortness of breath, swelling)
- severe or increasing pain in the treatment area
Conclusion
Botulinum toxin is a well-researched active substance which, when used appropriately, has a favourable safety profile in both aesthetic and medical practice. As with any treatment, side effects can occur – but most are local, temporary and mild. Those who are well informed, take advantage of a thorough medical consultation and ensure qualified administration create the best conditions for a safe treatment.
This article does not replace medical advice.