I have used the permethrin cream as directed by dermatoligist. two times, and then one extra time (total of 3) -- at 7 day intervals. Also then twice took Stromectol at 200 mcg/kg at one week intervals. Stopped by a Walmart and bought all new clothing and took nothing from home and stayed a week in a hotel. Undressed in plastic bag. Still seeing a few new bites. Can I take the Stromectol a third time?