Mefloquine is an antimalarial medication primarily used to prevent and treat malaria, particularly in areas where the disease is resistant to other treatments. It works by interfering with the growth of the malaria parasites in the red blood cells. Mefloquine is often prescribed for travelers visiting regions where malaria is common, such as parts of Africa and Southeast Asia. While effective, mefloquine can cause side effects, including dizziness, nausea, and sleep disturbances. In some cases, it may lead to more severe neurological or psychiatric symptoms. Due to these potential risks, healthcare providers typically evaluate a patient's medical history before prescribing mefloquine, ensuring it is a suitable option for malaria prevention or treatment.