The risk of serious complications after BOTOX injections is very low. If you are new to getting neuromodulator injections, talk to your provider about potential risks and what to look out for. Generally, the side effects of treatment are limited to temporary fatigue, a headache, flu-like feelings, and redness or swelling at the injection sites. With proper aftercare, the risk of migration or drooping is significantly lower. Though extremely rare, there is also a risk of allergic reaction to the ingredients in your neuromodulator. Signs of an allergic reaction include difficulty swallowing, unusual muscle weakness away from the treatment area, sore throat or cough, hoarse voice, or changes in vision.