I do not recommend using ivermectin as a preventative. Use it only if you need it.
I was a long hauler and only took 3mg tablet and another two weeks later and it helped clear up my lungs and other symptoms I had acquired.
More is certainly not better.
if your lungs are issue as mine were. How I cleared my lungs was doing steams with one drop eucalyptus essential oil to boiled distilled water twice a day. Mucinex - this will bring out a lot a fluid, be prepared. This was not pleasant but I did twic and it helped dramatically.
Hydrogen peroxide food grade 3 per cent in spray bottle.
Empty saline bottle and fill will hydrogen peroxide and do inhalation method explained on this website.
Nasal drip seems to be common and can cause lung issues as well. Ipratropium (Atrovent) nasal spray This helped me a lot, I had issues with runny nose that made me cough for45 minutes in morning. I got this spray prescribed by doctor, very effective.
Me and my husband suffered from covid for days. We took all kinds of things like lots of c, melatonin, zinc, etc. After really bad back pain for several days I realized it was probably my kidney. I took 5 charcoal pills and almost immediately my back pain and aches went away. Just the headache remained. After six hours I had to take more because symptoms returned. It also worked really well for my husband.
Interesting that you mentioned activated charcoal. Researchers are actually studying it out as a potential treatment for COVID.
Here's a link to that: https://www.sciencedirect.com/science/article/pii/S0306987720324245
Also, 21% of Covid cases come with a rash.
Below is a story of a medical doctor that got an antibiotic resistant rash after treating his first covid patient. He tried a charcoal poultice as a last resort, and it promptly disappeared.
What about activated charcoal capsules for COVID-19? They saved our family from norovirus a few years ago.