Not sure is Mrs D is still around (dont know if these two reactions can be in same fam) - but I cannot have novacaine at all (affects my heart and then fun trip to ER)..... I have tried the lidocaine patch a couple of times - each time had a reaction after wearing for a max time of only maybe 1/2 an hour - I cut off the adhesive thinking that might be it - didnt matter - got very red, sweaty, heart racing, etc with the patch and tape and had to rip that off tooo... the doc told me same thing - to stop asap... as there might have been some cross reactions....

Also, the first time I had the novacaine reaction was after years of novacaine shots at the dentist - the started out of nowhere - so reactions etc can start at any time.....