Bacterial pnuemonia? The purpose of anti-virals is not to let it get so far that complications develop. Once the infection is there, the elderly and immuno-compromised are virtually done for, antibiotic or no.
Here is another drug, same class as Tamiflu. Just to let everyone know because Tamiflu has an extremely limited production.
http://en.wikipedia.org/wiki/Zanamivir
"Once the infection is there, the elderly and immuno-compromised are virtually done for..."
In the case of the Great Flu Epidemic of 1918, most of its victims were between late teens and late twenties.