I just saw this, on Fever Tree’s website...
HOW MUCH QUININE DO YOU USE IN EACH BOTTLE?
All of our tonic waters contain quinine at a level permitted by the FSA and the FDA; the exact amount we use in each flavor is a closely guarded secret. However, in every product, the proportion of quinine is still very significantly below the levels found in anti-malaria drugs.
IF I DRINK ENOUGH OF YOUR TONIC WOULD IT HAVE THE SAME EFFECT AS TAKING A DOSE OF HYDROXYCHLOROQUINE?
No, anti-malaria drugs contain a significantly higher amount of quinine than tonic water so we would not advise using our tonic water for anything other than making a delicious drink to keep your spirits up during this difficult time.
https://fever-tree.com/en_US/article/quinine-and-coronavirus
Sounds like a very nice tonic water, though :-)
It’s about 10% of the medicinal dose but I mix in bitters with quinine.