Do Injections Hurt?
What Should I Do After Receiving an Injection? No exercising or lying down for two hours after injections is recommended. Do not excessively touch the area that was treated for the first 4 hours after injection. How Long Does It Last? The effects last for up to four to six months. However, in treatment around the jaw area multiple treatments (usually 2-3) over a period of 2-3 months may be required.