EndWarts Pen is an effective wart treatment that takes only seconds to apply. The solution can be used by the whole family to remove warts and verrucas on hands, feet, elbows and knees. Using End Warts Pen takes only a few seconds once a week, so the wart treatment itself causes little or no stress nor interruption of your day. The formic acid is absorbed directly into the wart and dries instantly so you can continue your day with minimal disruption. The pen contains enough acid for approximately 30 treatments. 2 Since no viruses can survive in the solution, the same pen can be used by several family members. But if you have two or more warts that need to be treated, there is no advantage in sharing it with others