Cupronickel or copper-nickel is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese.
Despite the low risk of side effects, it's important to take caution when using Oscillococcinum in treatment of the flu. Because the flu virus can lead to complications like pneumonia (a potentially life-threatening condition), you should seek medical attention if you experience flu symptoms such as coughing, sore throat, muscle aches, fatigue, headache, and high fever.
Some less common side effects include: 1  Rebound effect (increased activity or a bad mood as the medication wears off) 2  Transient muscle movements or sounds called tics. 3  Minor growth delay.  Very rare side effects 1  include. Significant increase in blood pressure or heart rate.  Bizarre behaviors.