What should not take when you are running a fever?

When running a fever, you should avoid taking aspirin, especially in children and teenagers, due to the risk of Reye's syndrome. It's also wise to steer clear of alcohol and recreational drugs, as they can dehydrate you and exacerbate symptoms. Additionally, avoid caffeine, which may lead to further dehydration and interfere with your body’s ability to rest and recover. Always consult a healthcare professional for personalized advice.