Single application will cure it but can reapply it within 14 days if it reappears.
Can apply atarax if itching.
Next Steps
The other aspect to be considered is eradicating the mites completely. All undergarments should be washed in warm water & dried and ironed. Shirts and trousers should be washed in hot water and ironed inside out in the seams. Bed linen, pillow covers, pillows, mattresses should be dusted & sunned.