Two types of side effects or complications can arise from Botox use. The first list below contains the most common symptoms that don't necessarily indicate a serious problem or reaction. The second list includes issues you should contact a doctor about or seek immediate medical attention for. These lists may not be complete, are provided as a general overview only, and should not be used in place of valid medical advice.   Normal Reactions   ᐅ Injection site pain ᐅ Injection site swelling ᐅ Injection site bruising ᐅ Headache ᐅ Nausea or vomiting ᐅ Paralysis in the injection area ᐅ Respiratory infections ᐅ Facial alignment issues Severe Reactions Requiring Immediate Medical Attention   ᐅ Breathing Problems ᐅ Trouble swallowing ᐅ Trouble speaking ᐅ Vision Problems ᐅ Loss of Bladder Control