Thusly, the doctor can prescribe an off label drug use, but the patient ends up paying a multi thousand dollar bill.
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No, this stuff is inexpensive. I don’t have it handy but an article the other day said the cost was around $20 for a one month supply at the dosage used for malaria IIRC.
Yes, about $20 at GoodRX prices. Old-fashioned quinine made from tree bark I got for roughly the same price as the synthetic drug.