I also was taking Clindamycin and vicodine. Not sure if dentist used novicane or lidocane. This is a false positive but lab said not a chance.
There are many antibiotics such as Clindamycin that will cause a false positive for cocaine. The following is a link to a list of medicines and what they can cause as far as false positives. Under the a's is listed antibiotics and false positive for cocaine with the references cited.
Hope this helps,
Search for questions
Still looking for answers? Try searching for what you seek or ask your own question.