A stomach virus is not usually something that gets “killed” by a medicine inside the body. In most cases, the body clears the virus on its own, and treatment is focused on easing symptoms and preventing dehydration. The most important step is to replace lost fluids and rest while the stomach settles.
What can kill the virus is usually related to prevention outside the body. Viruses like norovirus can spread easily through vomit, stool, contaminated food, unwashed hands, and shared surfaces. Good handwashing with soap and water and careful cleaning of bathrooms, sinks, and other frequently touched areas help lower the risk of passing it to others.
During recovery, it also helps to drink water, oral rehydration solutions, or other gentle fluids, and to restart food slowly with simple, easy-to-digest options. Greasy, spicy, or very heavy meals can make symptoms worse while the stomach is still irritated. Read more about what to eat with the stomach flu and which foods to avoid.
If vomiting or diarrhea is severe, lasts more than a few days, or causes signs of dehydration, a general practitioner or gastroenterologist should evaluate it. Self-medication should be avoided, especially antibiotics or anti-diarrhea medicines without medical advice.