What effects does it have?

  • Face

    Reduction of wrinkles

What is it?

Injections of a chemical into the face to relax the muscles and reduce wrinkles.

It's also known as Botulinum toxin or Dysport.

How long does it last?

The effects for three to four months, after which the skin returns to its original appearance.

More information

As botulinum toxin (Botox) is a paralytic, muscles in other parts of the face can accidentally be affected. This can cause unwanted changes to physical appearance.

In a review of medical studies of botox, common side effects of treatment in the upper face are blepharoptosis (partly closed upper eyelid) in 2.5% of patients studied, brow ptosis (drooping eyebrow) in 3.1%, and eye sensory disorders in 3%.

Common side effects of treatment with botox in the lower face are lip asymmetries and imbalances, seen in 6.9% of patients studied.

All of these symptoms were temporary 1.

The long-term effects of repeated botox injections remain unknown and have not yet been studied 2.

You can read more about botox on the NHS Choices website.


  1. 1 Cavallini, Maurizio, Cirillo, Pierfrancesco, Fundarò, Salvatore Piero, Quartucci, Sandro, et al. (2014) “Safety of botulinum toxin A in aesthetic treatments: a systematic review of clinical studies.” Dermatologic Surgery, 40(5), pp. 525–536.
  2. 2 Gadhia, K and Walmsley, AD (2009) “Facial aesthetics: is botulinum toxin treatment effective and safe? A systematic review of randomised controlled trials.” British dental journal, 207(5), pp. E9–E9.

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Page last updated: June 2017