PROBABLY because it was ILLEGAL or looked down on to prescribe it UNTIL people were IN the hospital and DYING!
Perhaps you should read the study before making guesses.
Yep
I have read that several people in the ICU on ventilators with hours to live have been brought back witheither smuggled Ivermectin or judge ordered stuff. At least one hospital defied a court order and thus killed the patient.
Probably they were treated very late. Timing of taking the drug is critical. Use is effective only in the first 48 to 72 hours of diagnosis, after that, it’s effectiveness diminishes rapidly. My guess is Big Pharma could not care less.