Are there any drugs that would be harmful when combined with tetanus toxoid? Or would make them, tetanus toxoid, or both ineffective? My character has been having a nightly fever she ignored for two nights (along with a sore throat), which turned into an actual fever the day she went out to get a tetanus toxoid shot, as she got injured and wasn't sure when she'd had her last shot. She has a relative who's a doctor but she's keeping the tetanus toxoid episode from her. This relative prescribes paracetamol (Biogesic) and gets my character an antibiotic (don't have any names as of yet) a bit later.
I tried googling any combination of "tetanus toxoid + paracetamol/Biogesic/antibiotic + harmful/dangerous", but didn't get anything relevant.