Side effects can be serious when you're on a steroid. Mixing alcohol with a large amount of steroids may increase this risk, although this is uncertain. Some serious side effects include pancreatitis, coughing up blood, swelling, rapid weight gain, eye pain, seeing halos, low potassium (which can cause an uneven heartbeat, muscular weakness, and other effects), and dangerously high blood pressure, which can be indicated by a severe headache, seizure, uneven heartbeat, chest pain, and other symptoms. Less serious symptoms caused by steroid use include insomnia, mood changes, acne, slower healing, dizziness, and changes in the shape or location of body fat. These side effects may be made worse with the use of alcohol, particularly in stomach-related symptoms. If you or someone you know experiences these symptoms related to steroid and alcohol use, contact a medical professional immediately for care.