Like any injection-based procedure, treatment with Kybella may come with some minor pain. Additional side effects from the drug, like burning, swelling, tenderness, or itching may also occur during and after treatment. You may suffer from painful swelling under the chin for days, or even weeks. Because everyone is different, it’s hard to predict how long side effects will last for you. This is not a comprehensive list of side effects. How long will treatment with Kybella take? How long will it take to see results from treatment with Kybella? How many Kybella treatments do I need? How long will treatment with Kybella last?