I need ivermectin drops for my guinea pig sent to the United States, anyone know how I can get them?

You can use ivermectin for horses. I got some at a feed store. Talk to a vet about proper dosage or you can easily overdose. Or you can always get the meds from the vet.

Ivermectin is commercially available at many online retailers based in the US. However, it is usually used for the treatment of internal parasites in smaller animals, and topical use is mainly for cattle and other livestock. As such, most topical ivermectin available is in large quantities, and may be too strong. Try to find a vet or humane society that regularly sees guinea pigs, and is willing to give some advice over the phone on how to administer the treatment. You may have to buy the smallest amount of livestock ivermectin you can find, and give a very small amount.