Read this. It tells how much near the bottom. It has the doses to take before you get infected and those to take after you are infected or know you are exposed. I already had it on hand also for the same reasons. I had quit taking it over a year ago, but I have plenty left! Once you ramp up the dose for a couple of days, you just take it once a week to maintain it in your system. https://www.reddit.com/r/medicine/comments/fbfj0r/covid19_prophylaxis_in_healthcare_workers/?utm_source=BD&utm_medium=Search&utm_name=Bing&utm_content=PSR1