Dysport 500IU Injection is used in the treatment of localized muscle spasm. It relieves wry neck (spasmodic torticollis) in adults, involuntary closure of eyelids (blepharospasm), and foot deformity due to spasticity in children with cerebral palsy. It may also be prescribed for chronic migraines. Dysport 500IU Injection is a prescription medicine that must be administered by a healthcare professional. You must receive the exact dose of it as per the prescription. An overdose of this medicine may have serious side effects on the body. The common side effects of this medicine are muscle weakness and tiredness. It may also cause flu-like symptoms and injection site reactions such as redness, pain, and swelling. Let your doctor know if any of these side effects persist or get worse. They may be able to suggest ways to manage or prevent the side effects. Before taking this medicine, let your doctor know if you have any preexisting medical conditions. Let your doctor also know about all the medicines you are taking. This will ensure your safety.