Jeuveau ® is an FDA-approved prescription medicine used to improve the look of moderate to severe frown lines between the eyebrows (glabellar lines) in adults. Ask your doctor to tell you all about Jeuveau ®. The effects of Jeuveau ® may spread hours to weeks after injection causing serious symptoms. Alert your doctor right away as difficulty swallowing, speaking, breathing, eye problems or muscle weakness can be a sign of a life-threatening condition. Side effects may include allergic reactions, injection-site pain, eyelid drooping, and swelling.