Flue/cold: a dish with an onion cut into little pieces.
Sore throat: fresh lemon juice, hot water (like tea) with honey
And sliced onion in damp cloth around your neck with scarf or something similar.
Of course, Vitamine C helps, and drinking a lot of water...
For the rest, sleep will help too
/me is not the person to take medicine, unless precribed by doctor...so far only after surgery for me