Oscillococcinum by Boiron (Oscillo) Oscillococcinum (O-SILL-O-COX-SEE-NUM) is the number one flu medicine of France, is becoming increasingly popular in the United States.  This homeopathic medicine has been shown in clinical studies to decrease the duration and intensity of flu symptoms.  Because of it's safety, Oscillo is a good first line defense in treating the flu.