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Disclaimer: I have no problem with people taking Ivermectin repurposed to use as prophylaxis or treatment for COVID-19. I'm sorry this is such a long post.

If you want to take it, knowing we don't know the side effects of the medication in people with COVID-19 and are hoping it's just the side effects we see when used as an anti parasitic agent, that is fine by me. I also believe that would be a reasonable assumption in light of what we are facing with COVID-19 and the lack of therapies for the disease.

With that out of the way I have yet to find a good study that would lead me to believe that Ivermectin is an effective prophylactic. The phase 3 vaccine trials show the problem. The placebo arm in one of those trials had approx. 15,000 people in it. They only had 95 people come down with the disease in that arm. So we will likely never know if Ivermectin is a good prophylactic as too few people get the disease in any given short timeframe (a few months).

For treatment there have been some small studies done outside Europe/US/Canada. It's enough to want to try it if I came down with COVID-19, its enough to want to put together a US trial of the medication. But it is no where near the glowing report given by the Doctor above. I get that he is trying to stir up some enthusiasm to make the drug more readily available for use and to drum up some money so it can be studied further.

Ivermectin is about where Hydroxychloroquine was 6 - 9 months ago. While I was very hopeful for HCQ only one US study found an effect vs. 3 or 4 studies showing no effect or no effect with unwanted side effects.

Think about remdesevir it initially was thought to be promising but the latest data found no mortality benefit. The hospital near me just dropped it from its recommended protocol. This is for a 'new' drug with a lot of money behind it.

There are problems for Ivermectin when we study it. The current dosing 0.2mg/kg is the standard dosing of the medication for its usual purposes. If you extrapolate from in vitro studies showing SARS-CoV-2 killing properties you find that it is significantly under dosed at concentrations found in lung tissue. See:
The Approved Dose of Ivermectin Alone is not the Ideal Dose for the Treatment of COVID-19 Authors: Virginia D. Schmith, PhD et al.

OTC treatments that have some good data behind them

Famotidine (Pepcid)

There is a pretty good cohort study showing Famotidine (Pepcid) decreases the incidence of intubation and death in hospitalized patients with COVID-19:
Famotidine Use Is Associated With Improved Clinical Outcomes in Hospitalized COVID-19 Patients: A Propensity Score Matched Retrospective Cohort Study

What about regular antihistamines? It turns out they are beneficial too:
Dual-histamine receptor blockade with cetirizine - famotidine reduces pulmonary symptoms in COVID-19 patients

in vitro research of University of Florida and accompanying patient records search of University of California patients provides evidence that H1 antihistamines (Benadryl, atarax) seem to prevent infection:
Identification of antiviral antihistamines for COVID-19 repurposing

Melatonin

Cleveland Clinic reported on a records search, showing that people (in their database) that take Melatonin have a decreased incidence of COVID-19 than patients who do not. They of course warn that this does not mean you should rush out to take the supplement but it is certainly interesting.
The following review of Melatonin gives good background on why it should work. Why if you get the vaccine Melatonin will probably make it more effective. It also tells of a study at Columbia University where intubated patient's receiving Melatonin got better more quickly than those not taking melatonin. It has been used successfully in neonatal sepsis (important because this shows human efficacy better than a rat trial; important because sepsis is the underlying theme with worsening COVID-19 patients).
Can Melatonin Be a Potential “Silver Bullet” in Treating COVID-19 Patients?

Vitamin C

There is very little I can find on oral Vitamin C and COVID-19. Much of the research centers on intravenous Vitamin C. Certainly there have been studies showing that many COVID-19 patients are low in Vitamin C. There are many biochemical reasons why Vitamin C would be helpful to patients with COVID-19. Given that it is a pretty harmless, inexpensive vitamin and it has a role in immune system function, no reason not to be taking it (unless you have a high propensity for kidney stones).

Vitamin D

Many people with COVID-19 are vitamin D deficient. Vitamin D deficiency is implicated in promoting increased thrombosis (blood clots). Basically the starting state we don't want to be in if we come down with COVID-19. COVID-19 can cause clots to form in the microvasculature which, if you get enough of them, causes organ damage.

If you are deficient to begin with, it takes time to get to normal levels of Vitamin D. Many diseases where vitamin D deficiency plays a role, studies find no benefit to Vitamin D supplements. However, if you can't keep a regular appointment with getting some sunlight, what choice do you have but to use supplements?

My own suspicion is that we will not find a good study about Vitamin D. Mainly because it can take months to get your vitamin D stores where they belong. You don't want to be deficient and if you can't get regular sunlight you have no choice but to use a vitamin D supplement.

The following study abstract highlights the issue:
Vitamin D deficiency aggravates COVID-19: systematic review and meta-analysis

This abstract shows that having proper vitamin D levels won't prevent COVID-19, but if you are deficient you are likely to have a worse outcome. Now does Vitamin D supplementation help you or are people with normal levels of Vitamin D (without trying very hard) just in better health? We don't know and short of finding these people and doing everything that they do, again, what choice do you have but to take Vitamin D supplements.

Zinc

Zinc has always been implicated in the alternative medicine community as being helpful in viral infections. Certainly there is molecular biologic evidence that zinc is used at the cellular level to interrupt virus replication. In terms of macro evidence Zinc follows along the lines of Vitamin D. You don't want to be Zinc deficient when you come down with COVID-19. Here is a recent small prospective study looking at just that:
COVID-19: Poor outcomes in patients with zinc deficiency

other supplements

vitamin K2
Vitamin D3 and K2 and their potential contribution to reducing the COVID-19 mortality rate

selenium - follows the same lines as zinc, vitamin D deficiency
quercitin - clinical trial proposed along with vitamin C
resveratrol - showed some in vitro activity against MERs
curcumin - due to its anti-inflammatory effects
thiamine - had shown some promise in sepsis in some studies
EGCG - green tea is good for everything
fish oil - anti-inflammatory effects, blood thinning effects
vitamin A - also an immune modulator, can be toxic if too much is taken
vitamin E - helpful in vitamin C metabolism, blood thinning effects, mixed tocopherols are the best form to take in general

Most of these have very little in research as it relates to COVID-19. Most are good for you for reasons other than COVID-19. Some you can get in a good health food store brand of multi-vitamin (preferred form). Some you can only get as individual supplements which gets expensive if you try to take all of them

Some studies that mention some of the above substances as potential therapies to consider:
Strategies for Targeting SARS CoV-2: Small Molecule Inhibitors—The Current Status
Candidate drugs against SARS-CoV-2 and COVID-19

Final thoughts on Ivermectin

Most of the resistance to obtaining Ivermectin is because doctors don't use it very much. If you had scabies I doubt your doctor would give you a prescription for ivermectin. You would get a body wash with an insecticide in it instead. That insecticide has adverse effects (probably worse than ivermectin) but the doctors are familiar with it and it's considered the first line of therapy.

So given the fact that you can't even get Ivermectin for what it is approved for, can you blame doctors for not giving it to you when you have a disease that you might die from? Not to mention what if having COVID-19 makes you more susceptible to the serious side effects of Ivermectin like Steven-Johnson syndrome or hepatitis? A study of 79 patients in Bangladesh is not going to make many doctors jump outside of the current standard of care.

Ivermectin has been talked about early on in this pandemic. I believe there is a US trial going on to determine its usefulness. I see people touting in vitro studies as if they prove the effectiveness of a drug. Studies in rats aren't much better. They may help to sift through which compounds to study but they are a far way off from being proven effective. Small human trials are better they give hope that a larger trial will be successful. But until a larger clinical trial at an institution in the United States/EU/Canada is done you are way off the mark to say Ivermectin is effective against COVID-19.

Should you be able to take Ivermectin if you come down with COVID-19, absolutely with the informed knowledge that you are experimenting on yourself and you may risk death or adverse side effects of the drug. It would be nice if you could sign a form releasing the doctor from liability if you take it. But that is not the present state of medicine in the US right now.