Tamiflu should be utilized and treatments should be started the moment symptoms start appearing in the human body. These include muscle aches chills, fever, sore throat and stuffy or runny nose. Tamiflu should be taken for as many days as it has been prescribed by the doctor and the entire medical course should be completed even if the patient starts feeling better after a single dose. Though the medicine is extremely effective, it has certain side effects. These include hallucinations, delirium, unusual behavior, confusion or injuring oneself. Though these side effects happen to everyone, it has been mostly found to have occurred in children. Signs of confusion, dizziness and self injury are the most common forms of the side effects. If at any point of time, such symptoms are seen, doctor should be consulted most urgently.

It is often not safe to purchase Tamiflu online or from vendors outside the United States. There have been various samples of "Tamiflu" that were purchased online and were found to contain cloxacillin. This cloxacillin is a form of antibiotic that might have serious side effects on people who are allergic to penicillin. Hence, online purchase or purchase from any casual pharmacy might prove to be dangerous.

Before consuming the drug Tamiflu, doctors should be consulted regarding any previous records of a nasal flu vaccine that a person might have taken within the past 2 weeks. Doctor's suggestion should be taken in case of medical conditions that include kidney disease; heart disease, a condition leading to swelling or any form of disorder of the brain; lung disease; or any other serious disease or health trouble.