That's just not something you can treat over the counter you'll have to go to a urologist.

I forgot to mention, depending how bad they are, you may not get medication. They will freeze them off, and that burns!

Genital Warts need to frozen off with Liquid Nitrogen. Most STI Clinics keep these devices, and sometimes the Warts need a second freezing

There is no over the counter medication for genital warts, you need to see a doctor for a prescription. As to where to find treatment, start with your local health department.