I have pnemonia after going under anesthsia complications due to aspiration into my lungs.  Im on antibiotic for about 7 days.  I need to be on it fo ten days.  I had a great amount blood in my stools and on tp.  Bright red.  Im having back pain and constipated.  Is this from the antibiotic?
The blood in the stool can be definitely due to oral antibiotics, but the symptoms of back-pain and constipation are not related to antibiotics. These may be due to lack of activity, less fluid intake etc.