Ivermectin treats scabies at 200 mcg/kg — but one dose only achieves 58% cure vs 98% with two doses 14 days apart. This 2026 CDC-based guide covers why ivermectin must be taken with food for scabies, the crusted scabies intensive protocol, weight-based dosing table, environmental decontamination steps, simultaneous household contact treatment, and why itching continues after successful treatment.