Hey Benny, welcome. Ever since a certain misinformation campaign went around in 2020 promoting ivermectin for things it can't do (except increase someone's stock shares), some places have restricted the sale of ivermectin to stop gullible people from sending themselves and their kids to heaven in stupid ways. Try your local veterinarian. They should be able to provide you with a correct type/dose/strength of ivermectin, be able to give you solid information about its correct use, effectiveness, risks, and side effects, and give you information about any other products that have more recently come onto the market that might be better to use. Veterinary medicine is constantly improving, it's always worth checking in now and then to see what new things are available.