So far this year in San Francisco, 621 people have died of drug overdoses. This is a record.It is also far greater than the number of COVID-19 deaths in the California city. As of December 27, that number is 182.The main cause of the crisis is the powerful painkiller fentanyl.But the number of overdoses would be far higher without the use of an overdose-reversing medication called Narcan.The drug can be sprayed up the nose to quickly bring someone out of an overdose.The medication was used nearly 3,000 times from January to mid-November to save overdose victims, the San Francisco Chronicle and Associated Press reported.Last year, San Francisco reported 441 overdose deaths, a 70 percent increase from 2018.And 2019 saw 2,610 possible overdoses prevented by Narcan.The data comes from the city's Medical Examiner and the Drug Overdose Prevention and Education Project -- called DOPE for short.