Illegal fentanyl is made in laboratories financed by large criminal drug organizations, like the Mexican drug cartels. Other manmade opioids, chemically similar to fentanyl, are also produced - these are known as fentanyl analogs. It is sold to drug users in the following forms: as a powder, dropped on blotter paper like small candies, in eye droppers or nasal sprays, or made into pills that look like real prescription opioid tablets.