 [ Symptoms ] what medications and treatments are available to treat genital herpes [ Disease ] you will need to get the specific okay from your dentist to pre medicate with any narcotic before your visit while your dentist may only be using lidocaine novacaine for your procedure many times they will need to do something else like nitrous oxide depending on your response so it would be wise to just ask first there is unlikely to be a problem with you taking this after your visit