The 2 nyquil sever does not work for me can i take 4 pills instead?

Exercise caution: The package insert for NyQuil Severe says not to exceed 4 in 24 hours, which generally means you should space the four and not take close together. Flue symptoms take some time, usually 5-7 to resolve regardless of how much medicine you take. Main thing is to keep yourself hydrated, take extra vit C and some OTC meds to relieve annoying symptoms like headache, and cough.