RE: I’ve been taking ivermectin prophylactically.
It would be helpful for readers of this thread if you could share with us how you were able to get a prescription for prophylaxis. Thanks.
Yes
1 tube = 1200 pound horse.
1/6 tube = 200 pound "horse".
1/12 tube = 100 pound "horse".

I obtained Ivermectin from the FLCCC (Front Line COVID-19 Critical Care Alliance). If you don’t live in the US, you will not be able to use their service, but if you do, and you want Ivermectin, go to “For Patients” and click on “Getting Ivermectin.” You will get a list of doctors from whom you can obtain a prescription.
After choosing a doctor licensed to practice in my state, I had a phone consultation with her. She phoned in the prescription to a CVS local to me, so all I had to do was go to the CVS. The consultation with the doctor cost $90. The prescription, which will last a little over 11 weeks if I take it as a prophylactic, cost $61.23.
Your dose depends on your body weight. The directions for prophylactic use are to take a dose today, then another dose in 48 hours. Then take a dose once a week.