So now you think it does not sound so bad, after all. Then, what side effects are we talking about? The more normal ones include redness at the injection site, local numbness, swelling, bruising, muscle weakness and facial pain. 1285 Muscle There can also be temporary headache, nausea and other flu-like symptoms. Some have even reported cases of upper respiratory tract infection. Other complications would include squinting, double vision, ptosis (drooping of the eyes) or even dysphasia (impairment of speech and language comprehension) in extreme cases.http://www.healthcaresup.com/1285-muscle/