The letters HPUS indicate that the active ingredients are officially included in the Homeopathic Pharmacopœia of the United States.
Oscillococcinum: Drug Facts
Temporarily relieves flu-like symptoms such as body aches, headache, fever, chills and fatigue.
Adults and children 2 years of age and older: Dissolve entire contents of one tube in the mouth every 6 hours, up to 3 times a day.
Children under 2 years of age: Ask a doctor.