Best used as a prophylactic -- in other words it works very well ijn place of a vaccine .. If you know of covid or flu infection in your immediate environment , use IVM before you get symptoms, or if you start to get symptoms use it asap in the doses sierra suggests .
It can be accumulative so no need to use it until required-- either as soon as you learn of local infection or as soon as you get symptoms.
IVM is safe and effective -- it won a nobel prize for exactly that.
