Are there any side effects?

Only tiny amounts of Botulinum Toxin are used, so this treatment is not harmful. The most common side effects are temporary and localised bruising, slight redness of the skin and occasionally slight swelling at the injection site. Rare side effects are; bruising/swelling/redness at injection site, allergic reactions, infection, nausea, drooping of the eyebrow or upper eyelid or swelling and redness in eyelids, headache or flu-like symptoms, occasional numbness, rash, photosensitivity, dry mouth, dizziness and dry skin.