<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello:I am a 57 year old female that had shingles on my eyelid and ruined my cornea 4 years ago. The Ophthalmologist put me on 800mg of acyclovir for a maintenance dose now. I am having abdominal pain and blood in my stools now. I have had outbreaks if not on acyclovir. Not sure what to do. I have not had a shingles shot.  <response>: Acyclovir is known to cause abdominal pains. Talk to your doctor about modification of the dose or for addition of certain anti-hyperacidity medicines like pantoprazole. However, it is unlikely to cause the bloody stools. Rather it is more likely that you have got a bacterial infection along. The infection needs to be treated with antibiotics. Please get a stool routine microscopy test done and visit your doctor with the report. Based on that he will be able to administer proper antibiotics which are essential in such a case. Take Oral rely Chat Doctor. 