Ivermectin Oral Tablet: Side Effects, Uses, Dosage, and More https://www.dosepharmacy.com/iverheal-6mg-tablet-ivermectin Onchocerciasis (river blindness): This is a parasitic infection that is caused by the worm Onchocerca volvulus. It is spread by blackflies. Onchocerciasis can cause blindness and other serious health problems.