Mefloquine, an antimalarial drug used by the US Army, has sparked controversy over potential neuropsychiatric side effects. Soldiers exposed to mefloquine have reported symptoms such as hallucinations, paranoia, insomnia, and depression, leading to concerns about the drug's safety. Critics allege that the military has ignored or downplayed these adverse effects, endangering the health of its soldiers. The Army maintains that mefloquine is an effective antimalarial with an acceptable safety profile when used as directed. However, the debate continues, with ongoing research and advocacy efforts aimed at investigating and addressing the potential risks associated with mefloquine use in military personnel.