Hello,
Thanks for the query to H.C.M. Forum.
Prilosec i.e.
omeprazole have following side effects , diarrhea,
constipation, nausea, fatigue, headache,
dizziness, weakness.
Blood in stool don't have any relation with use of prilosec, however sometimes there may be cramps in abdomen.
So blood in stool may be due to ,
1 Hemorrhoids , most common cause , can be confirmed by physical examination by a surgeon and if , then get a treatment .
2 May be disease in large intestine so get in
colonoscopy and consult a surgeon and get his opinion.
3 Uncommon reason may be blood disorder.
In my opinion consultation with a surgeon will find out the exact nature of disease.
Good luck.
Dr. HET