“Instead of ‘peanut flour,’ Aimmune calls the drug Palforzia. It does not promise to give people an ability to eat peanuts—only to potentially protect a person in the case of a small, accidental ingestion. Analysts have put the cost at $4,200 per year. The drug would have to be taken indefinitely.” James Hamblin with an interesting look at peanut allergies, the efforts to limit the threat, and the crazy world of drug pricing. How Peanuts Became a $4,200 Drug.