A person misusing Vicodin will often appear to be sedated or drowsy. Vicodin can cause a slowed heart rate and lightheadedness when taken in large doses. While a common side effect of Vicodin is a euphoric feeling or a sense of calm when abused, this can quickly turn into someone appearing “out of it” much of the time.
Physical symptoms can occur, especially when the drug is being misused. Possible physical symptoms include muscle weakness, blurred vision, and a disoriented sensation. When someone has become addicted, they may experience muscle aches, nausea, or vomiting between uses.