Natural quinine bark is still employed in herbal medicine systems around the world today. In Brazilian herbal medicine quinine bark is considered a tonic, a digestive stimulant, and fever-reducer. It is used for anemia, indigestion, gastrointestinal disorders, general fatigue, fevers, malaria and as an appetite stimulant.
Other folk remedies in South America cite quinine bark as a natural remedy for cancer (breast, glands, liver, mesentery, spleen), amebic infections, heart problems, colds, diarrhea, dysentery, dyspepsia, fevers, flu, hangover, lumbago, malaria, neuralgia, pneumonia, sciatica, typhoid, and varicose veins.
In European herbal medicine the bark is considered antiprotozoal, antispasmodic, antimalarial, a bitter tonic, and a fever-reducer. There it is used as an appetite stimulant, for hair loss, alcoholism, liver, spleen, and gallbladder disorders; and to treat irregular heart beat, anemia, leg cramps, and fevers of all kinds.
In the U.S., quinine bark is used as a tonic and digestive aid; to reduce heart palpitations and normalize heart functions; to stimulate digestion and appetite; for hemorrhoids, varicose veins, headaches, leg cramps, colds, flu, and indigestion; and for its astringent, bactericidal, and anesthetic actions in various other conditions
Quinine is bitter, astringent, acrid, thermogenic, febrifugre, oxytoxic and anodyne, digestive, antipyretic, cardiotonic, anti-inflammatory and tonic. It is useful in malerial and intermittent fevers, lumbago, bacterial infections, helminthiasis, dyspepsia, chronic dysentery, skin diseases, cough, bronchitis and cardiac debility
The powdered bark is often used in tooth-powders, owing to its astringency. Cinchona in decoction is a useful gargle and a good throat astringent.