My mother was given the tdap vaccine in subcutaneous tissue instead of a muscle. is it still effective if given sq instead of im?

Delayed response: The intramuscular administration allows for a more rapid & dependable dispersion of the vaccine and typical response. Sub q administration can go into fatty tissue with less blood supply & will likely slow the response to the vaccine. It should eventually be fine.

Yes it is: Yes it is still effective as it will eventually get absorped in the blood stream