My 86 Year Old Mother Is In Rehab. They Have

My 86 year old mother is in rehab. They have an outbreak of Norwegian scabies and want to give her 3 3mg tabs of ivermectin. Mom had glaucoma, diabetic retenopothy, and macular degeneration and dementia. I see one of the side effects of ivermectin can be vision problems and often has excessive reactions to medications. I asked of side effects and was only told about the possible diarrhea. Is this safe for her to take and do we have a choice?