Japan is not using Ivermectin. It's a myth that is spreading in the Ivermectin conspiracy circles, but it's not true: https://www.reuters.com/article/factcheck-japan-ivermectinan...
India stopped recommending Ivermectin a long time ago, after not seeing positive results: https://www.thehindu.com/news/national/icmr-stops-use-of-ive...
Brazil's relationship with Ivermectin is mixed at best, but the famed "COVID Kit" that included Ivermectin (among other things) wasn't as official as some try to make it sound: https://www.thelancet.com/journals/lanam/article/PIIS2667-19...
I'm still stunned by how these rumors continue to circulate as facts despite being so easily disproven. On the other hand, some of the top Google results I found while looking those up quickly were obvious conspiracy websites with false information. I suppose the misinformation is just flooding the internet so fast that the truth is getting diluted away.