Adipex, commonly prescribed as a short-term aid for weight loss, is a brand name for phentermine, a powerful appetite suppressant. While some online sources may advertise overnight delivery without a prescription, obtaining Adipex without a valid prescription is both illegal and unsafe. Phentermine can cause serious side effects and must be taken under medical supervision to avoid health risks like heart problems, high blood pressure, or dependency. Consumers are urged to avoid questionable online vendors and instead seek proper medical advice before considering this medication.