One of the most widely used drugs in medicine iodex is

The active ingredient in Iodex is 1. methyl salicylate.

It is a topical analgesic that is used to relieve pain and inflammation. It is also used to treat muscle pain, arthritis, and other types of pain.

Ethyl salicylate, acetyl salicylic acid, and o-hydroxy benzoic acid are also used as topical analgesics. However, they are not as widely used as methyl salicylate.