Is It Safe To Use Permethrin Or Ivermectin For Scabies?

Hi. For the treatment of scabies, which is less toxic and safer to use, permethrin or ivermectin? I used permethrin before. It worked, but I had an allergic reaction to it. I believe it was because I used too much. On telling my doctor this, he prescribed ivermectin, but I feel that permethrin is less toxic...?