There are (I believe) ONLY three cannabidioal based FDA approved drugs. They are: Dronabinol (Marinol), Nabilone (Cesamet) and the recently approved Epidiolex. Out of the three of them.
Out of these three ONLY Marinol actually needs to be derived from the pot plant. Nabilone is synthesized (no pot needed) and Epidiolex is based not on THC but on CBD.
Marinol is RARELY prescribed because there are drugs that are MUCH more effective.
The ONLY reason you're arguing this is because you apparently have been duped into believing that ingesting or smoking the marijuana plant is MEDICINE. You've been duped so that pro-pot advocates and their ilk can get high legally. That's the ONLY reason that marijuana EVER started getting talked about as "medicine".