It never occurred to me to take it as a preventative. Just want it on hand if I get it.
No reputable Dr will prescribe you medicines for something you dont have just so you can “have them on hand” in the rare case you contract something.
Instead, live smartly if you are afraid. If you are Immune Comp, you already know how to do that ( I learned!). If you are Elderly, you will need to be careful with whom you are physically close.
Living in abject Fear is more dangerous than the Virus. 98%+ Recovery and many/most ppl, at this point, are having Mild to Medium issues. A lot of ppl testing Positive are showing no Symptoms.