Influenza also known as ‘Flu’ is a virus that causes respiratory illness. This flu is highly-contagious and is commonly spread by sneezing and coughs of an infected person. This attacks the lungs, nose and throat and also to people with a weaker immune system. Symptoms include fever, chills, muscles aches, congestion, runny nose, headache etc. There are generic influenza drugs that can treat this condition and help you regain normal life.