cold sores
"Penciclovir is the active ingredient and it does work to clear cold sores faster.

For those wondering why it costs $700+ in the USA, & less than $20 in other countries, the reason is because the USA has been unsuccessrful in purchasing pharmaceuticals at discounted prices. The more countries that get discounts, the more the USA has to pay because drug companies want to cover their losses. Europe's ability to buy cheap medication depends on the pharmaceutical companies' assumption that the USA will pay full price plus enough to cover the discount to X country in Europe. Other countries' bargaining directly affects American drug prices. Americans need to put pressure on politicians and insist on drug bargaining to make healthcare affordable."