Auto-injectors are medical devices designed to deliver a specific dose of medication quickly and easily. They are often used for emergencies, such as treating severe allergic reactions with epinephrine or administering insulin for diabetes management. The device typically features a spring-loaded mechanism that allows users to inject the medication into their thigh or upper arm without needing to see a needle. These devices are user-friendly, making them suitable for people of all ages, including children. Auto-injectors come pre-filled with medication and are designed for single use, ensuring that patients receive the correct dosage when needed.