Anti-wrinkle injections (commonly referred to as Botox) are among the safest and most widely performed aesthetic treatments in the world. However, like all medical procedures, they carry a small risk of side effects. Understanding what to expect — and what is not normal — is an important part of making an informed decision. At The London Aesthetic Clinic, we believe in full transparency about both the benefits and the risks of every treatment we offer.
Common Side Effects (Normal and Expected)
The following side effects are common, expected, and typically resolve within a few days without any intervention:
| Side Effect | How Common | Duration | Action Required |
|---|---|---|---|
| Redness at injection site | Very common | 1–4 hours | None |
| Mild swelling | Common | 24–48 hours | Cold compress |
| Bruising | Common | 3–7 days | Arnica gel |
| Mild headache | Common | 24 hours | Paracetamol |
| Tenderness at injection site | Common | 24–48 hours | None |
| Temporary asymmetry | Uncommon | 1–2 weeks | Review appointment |
Rare but Possible Side Effects
The following side effects are uncommon but possible. They are more likely to occur when treatment is performed by an inexperienced or unqualified practitioner — which is why choosing a reputable, medically qualified clinic is essential:
Eyelid Ptosis (Drooping)
Ptosis — drooping of the upper eyelid — can occur if the product migrates to the levator palpebrae superioris muscle. It is temporary, resolving as the product wears off (typically within 4–6 weeks). The risk is minimised by precise injection technique and appropriate dosing.
Brow Ptosis (Heavy Brows)
Overtreatment of the forehead can cause the brows to drop, creating a heavy, tired appearance. This is avoided by careful assessment of brow position and conservative dosing, particularly in clients with naturally low brows.
Asymmetry
Mild asymmetry can occur if the product distributes unevenly or if the underlying muscle activity is asymmetric. This can usually be corrected at a follow-up appointment (typically 2 weeks after treatment) with a small top-up dose.
How to Minimise Side Effects
Following your aftercare instructions carefully significantly reduces the risk of side effects:
- Do not rub or massage the treated area for 24 hours
- Avoid strenuous exercise for 24 hours
- Avoid alcohol for 24 hours
- Do not lie down for 4 hours after treatment
- Avoid extreme heat (saunas, hot yoga, sunbathing) for 24 hours
- Avoid blood-thinning medications (aspirin, ibuprofen) for 24 hours before and after treatment (unless prescribed)
When to Contact Your Clinic
Contact The London Aesthetic Clinic immediately if you experience any of the following after treatment: difficulty swallowing or breathing, severe or worsening headache, vision changes, signs of infection (increasing redness, warmth, or pus), or any other symptoms that concern you.
Frequently Asked Questions
How long do Botox side effects last?
Most common side effects — such as mild redness, swelling, or bruising at the injection site — resolve within 24–72 hours. Headaches, if they occur, typically resolve within 24 hours.
Is it normal to have a headache after Botox?
A mild headache after anti-wrinkle injections is relatively common and usually resolves within 24 hours. Over-the-counter pain relief such as paracetamol can help. If the headache is severe or persistent, contact your clinic.
Can Botox cause drooping eyelids?
Eyelid ptosis (drooping) is a rare but known side effect of anti-wrinkle injections in the forehead or brow area. It occurs when the product migrates to the levator palpebrae muscle. It is temporary and resolves as the product wears off, typically within 4–6 weeks.
What should I avoid after Botox to prevent side effects?
Avoid rubbing the treated area, strenuous exercise, alcohol, and lying down for 4 hours after treatment. Avoid extreme heat (saunas, hot yoga) for 24 hours. These precautions help prevent product migration.
Are Botox side effects serious?
Serious side effects from Botox are extremely rare when treatment is performed by a qualified medical professional using approved products. The vast majority of side effects are mild and temporary.
Safe Anti-Wrinkle Injections in London
Our medically qualified practitioners prioritise your safety above all else. Book a consultation to discuss your concerns and goals.
Book Consultation