[ad_1] Hydrocodone, marketed as Vicodin, is a narcotic analgesic used for severe pain, but can cause allergic reactions such as swelling, rash, and difficulty breathing. Narcotics are addictive and cause physical withdrawal symptoms. Drug allergies occur due to an immune system response, and anaphylaxis is a life-threatening allergic event. Side effects such as drowsiness, nausea, […]