“…In therapeutic applications, complications were mostly local and relatively mild, such as pain, erythema, ecchymosis of the region injected, dry eyes, mouth droop, ptosis and lid edema, facial muscle weakness, asymmetry of facial expression during dynamic facial movements, xerostomia, transient dysphagia, restricted mouth opening, nasal regurgitation and nasal speech, headache, blurred vision, dizziness, upset stomach, infection, neck weakness, voice changes, difficulties in chewing and breathing risk of aspiration, recurrent jaw dislocation, dysarthria, salivary duct calculi and local injuries of the carotid arteries or branches of the facial nerve 14,18,[24][25][26]44,45,61,65,79,94,98,129,153,155,157,159,162,207,214,228,232 . Systemic side effects are rarely reported, generally not dose related, and can include transient weakness, fatigue, nausea and pruritis 14 .…”