The best meta-study review of Ivermectin I've seen was done by Scott Alexander [0]. He individually reviewed a few dozen studies. His take was that Ivermectin is an effective dewormer that is useful as a prophylactic when people are widely exposed to worms. Because they don't catch worms, they're in better shape to fight Covid when infected. However Ivermectin has no effect in most developed countries where the general population isn't subject to worm infections.

[0] https://astralcodexten.substack.com/p/ivermectin-much-more-t...