Eyelid drooping after Botox (ptosis) is one of the rare but most concerning complications of botulinum toxin injections. It develops as a result of inadvertent weakening of the levator palpebrae superioris muscle, which is responsible for lifting the upper eyelid, and is generally a temporary condition.
Why Does It Occur?
Eyelid drooping develops as a result of diffusion of the botulinum toxin from the injection site to the levator muscle. It is most frequently observed following injections to the forehead and glabella (between the brows). The toxin migrating across the superior orbital rim to reach the levator muscle gives rise to this complication.
Risk factors include placing injections too close to the orbital rim, excessive dosing, rubbing the injection site post-procedure, and lying face-down after treatment. The incidence is below 1% in experienced hands.
Symptoms and Clinical Assessment
Ptosis typically presents 3–14 days after injection. It may be unilateral or bilateral. In mild cases, a 1–2 mm reduction in eyelid aperture is observed, while severe cases may restrict the visual field.
- Marked reduction in eyelid opening of the affected eye
- Asymmetric eye appearance
- Tired or drowsy expression
- Compensatory brow elevation in the affected side
Treatment Options
Botox-induced ptosis is a temporary condition that resolves spontaneously as the toxin effect wears off. This process generally takes 2–6 weeks. Apraclonidine 0.5% eye drops (which stimulate Müller's muscle and elevate the eyelid by 1–2 mm) may be used to accelerate resolution.
Phenylephrine 2.5% eye drops may also be considered as an alternative option. These drops provide symptomatic relief while the Botox effect naturally diminishes.
Prevention Strategies
The most effective way to prevent eyelid drooping is correct injection technique. Injection points should be placed at least 1 cm from the orbital rim. When injecting the corrugator muscle, the needle tip should be angled superiorly to prevent downward diffusion.
After the procedure, the patient should avoid lying face-down for 4–6 hours, refrain from rubbing the injection site, and avoid strenuous exercise.
This article is for informational purposes only. Please consult a qualified physician for treatment decisions.