How to avoid getting sick after meeting someone with the flu?

The only remedies recommended by WHO, i.e.

influenza neuraminidase inhibitors (oseltamivir and zanamivir, as well as peramivir and laninamivir, licensed in some countries).

www.who. int 2014

That is, for example, Tamiflu and Relenza.

adamantanes (amantadine and remantadine) 1 - mentioned, but with the reference that "currently circulating influenza viruses are resistant to adamantanes "

That is, again, for 2016:

Antiviral drugs are necessary for the treatment of epidemic and pandemic influenza. Almost all influenza A viruses circulating in humans are resistant to one category of antiviral drugs, M2 channel inhibitors (amantadine and rimantadine). However, resistance to neuraminidase inhibitors (oseltamivir) remains low (1-2% of cases) . Antiviral susceptibility monitoring is ongoing through the Global Influenza Surveillance and Response System.

www.who.int 2016

So, Tamiflu and its variants.

If after meeting with a sick flu, then you either have already become infected, or no longer, therefore all preventive measures disappear. Here you can take something stimulating interferon. There are a lot of them on the market now - "Kagocel", "Ribavirin" - it is better to take them a little in advance. There are specific medicines for influenza, but they are expensive - "Relenza", "Tamiflu" - so in this case you have to think, because after meeting with a sick person you may not get sick, and the money will be wasted.

The current flu strain is not very scary. In Moscow, there is now H3N2, which in 1968 was called "Hong Kong". It has been circulating in the population since this year, that is, it is a common flu, and there are almost no people left who do not have antibodies to it. That is, it will be a second disease, and you must be very unlucky to get very sick. If a person is, in principle, healthy and does not belong to risk groups, then it is better just not to worry.

Are you sure it was the flu? There were a lot of viral diseases this season, everyone was sick several times a season, especially children, and it was not the flu. This is where interferon stimulants will help, because they generally help against any infections.