FYI, Hartz dog flea shampoo used to list it removes lice. Of course, when too many people started using it instead of the more expensive Rid, they were made to delete that little tidbit off the label.
Thirty years ago, and I had hair, we had an outbreak of head lice in the school so all of us adults also took a lice treatment. Family used the popular treatment, I used a coal tar remedy for lice and dandruff. It was so strong, after using it I had to pour dish washing soap in my hair to remove it. It worked!
Dr. Something or other Coal Tar Dandruff Treatment. Can’t remember his exact name.
A few months later I was in a drug store in the pet isle and there was DR SOMETHING OR OTHER COAL TREATMENT FOR MANGE. Same bottle, same label, just “Mange” had replaced the words “Lice and Dandruff”.