Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. All drugs have its side effects, however when it comes to treating asp pneumonia, the benefit of the drug would surely outweigh its risks because not treating pneumonia may be very dangerous. So, yes, if its working its worth use. Other antibitoics may also work like Metronidazole plus Penicillin and most of the antibiotics would work but all have side effects. The best thing would be to avoid recurrence of asp pneumonia by either NG tube, or more better is PEG tube. Levoxin like any other antibiotics can cause C.diff but it has been very rarely associated with it that s what the study probably meant that its may cause but less then other antibiotics. Neuropathy is not common with levo. Also important is not all stool motions are C.diff, that rare and a bit serious, diarrhea occurs with drugs much more commonly without C diff. So to summarize it, it s not good to use it but if it cures asp pneumonia it s definitely worth use. Hope I have answered your query. Let me know if I can assist you further.