Better than even odds you are a fedposter bringing this stale shit up a year after it was popular...
Don't take doxycycline for influenza or any virus unless you are extremely sick already. It's only good with secondary bacterial infections, and if you are that sick you should find a good doctor.
Take Zinc and Quercetin daily while you have symptoms to inhibit RNA viral replication before you get really sick. This works on all influenza viruses, most cold viruses, and all strains of SARS-CoV-2. Stop taking zinc + quercetin after your symptoms go away. Zinc is not a daily vitamin.
Both are legal OTC. Vitamin D ad K2 are daily vitamins. Everyone should be taking those daily, especially if you are old.
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