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.
Doxycycline Side Effects. 1  Nausea and vomiting are the most common side effects associated with doxycycline. 2  Loss of appetite is a secondary side effect that goes hand in hand with the nausea and vomiting. 3  Diarrhea is an uncommon side effect of doxycycline.