Tamiflu (OSELTAMIVIR) is a drug used to treat infections caused by flu viruses. Tamiflu may decrease the length of time you experience symptoms of the flu by 1-2 days and reduce the risk of spreading the flu to others. 

You may take with or without food. To treat the flu, oseltamivir is usually given two times per day for 5 days.

Side effects difficulty breathing or shortness of breath ;infection and inflammation of the sinuses and chest ;skin rash

Side effects that usually do not require medical attention;coughing ;difficulty, sleeping, dizziness, headache, nausea and vomiting

Tamiflu is not a substitute for the flu shot. You should continue receiving an annual flu shot based upon the advice of your primary health care provider.