Unlicensed and unapproved drugs, these phrases might create a terrifying image.
You may imagine some seedy, under the table alternative to a vaccine. Possibly an outdated and dangerous medicine that has no place in modern society.
The world’s first vaccine may even come to mind. Pus from a cowpox boil was used to prevent smallpox in a practice that would cause nightmares today.
Actually, while the phrases are accurate, unlicensed and unapproved drugs don’t have to mean the medicine or vaccine is dangerous.