This is what I answered for someone recently concerning Botox :
This is what is listed with the manufacturer as some of the more common potential problems:
Adverse events occurring in approximately 10-20% of the subjects receiving brimonidine ophthalmic solution (0.1-0.2%) included: allergic conjunctivitis (itchy, watery eyes), conjunctival hyperemia, and eye pruritus. Adverse events occurring in approximately 5-9% included: burning sensation, conjunctival folliculosis, hypertension, ocular allergic reaction, oral dryness, and visual disturbance.
Adverse events occurring in approximately 1-4% of the subjects receiving brimonidine ophthalmic solution (0.1-0.2%) included: allergic reaction, asthenia, blepharitis, blepharoconjunctivitis, blurred vision, bronchitis, cataract, conjunctival edema, conjunctival hemorrhage, conjunctivitis, cough, dizziness, dyspepsia, dyspnea, epiphora, eye discharge, eye dryness, eye irritation, eye pain, eyelid edema, eyelid erythema, fatigue, flu syndrome, follicular conjunctivitis, foreign body sensation, gastrointestinal disorder, headache, hypercholesterolemia, hypotension, infection (primarily colds and respiratory infections), insomnia, keratitis, lid disorder, pharyngitis, photophobia, rash, rhinitis, sinus infection, sinusitis, somnolence, stinging, superficial punctate keratopathy, tearing, visual field defect, vitreous detachment, vitreous disorder, vitreous floaters, and worsened visual acuity.
The most common issues are watery and itchy eyes that could indicate allergies, eye burning and visual problems, and eye redness.
The best thing to do is to avoid droopy eyes by injecting the botox / dysport at least 1.5cm above the orbital rims edge above the eye. This avoid the botox from traveling to the muscle that lifts your eyelid which is responsible for the droopy eyelid that can happen if this muscle is affected.
I hope that helps you in some way!
Thanks for reading, Dr Young
Dr Young specializes in Facial Plastic and Reconstructive Surgery and is located in Bellevue near Seattle, Washington