When faced with a stressful situation, it's important to remain calm and avoid panicking. However, telling someone to "don't panic" may not always be the most effective way to calm them down. Instead, try using synonyms that convey a similar message but in a different way. For example, you could say "keep calm" or "stay composed". Other alternatives include "take a deep breath", "don't worry", or "remain level-headed". No matter which phrase you choose, the goal is to reassure others and help them stay focused and calm under pressure.