In clinical trials, patients did not require any downtime. However, common side effects of QWO may include significant injection site bruising, itching, swelling, and warmth in the treatment area. It may also become temporarily hard, red, or discolored. All side effects generally resolved on their own within 7-21 days, and bruising subsided in less than three weeks. The side effects tend to become less severe and resolve more quickly with each treatment session.
Although rare, QWO does have a risk of more serious side effects. These include allergic (hypersensitivity) reactions, including anaphylaxis.