It is a horse med in the dial syringe. It made me sleep for a whole day. I took it because I had very bad scattering and crawling all over and nothing else was helping.They reserve this med as a last resort in animals when the others dont work. It stopped all the crawling itching etc in two days with one dose. It is strong and knocks you out. You just take it by your weight. It didnt kill pin worms. The alinia and tetracycline worked well for them as did papaya seeds and enemas. Now Im taking pyrantel once or twice a week to kill off any remaining buggers of new hatches. They are seriously the hardest things to get rid of. I also found that taking the pyrantel and then following with magnesium citrate on weekends is working well. I am getting maybe 4 tiny hatchlings out each time and then I'm clear.