It should only be used when all other antibiotics have failed to work. The drug companies are not telling the doctors of the severe
side effects of this medication, and doctors are handing it out like candy. Make sure your father doesn't take this or nay other antibiotic in this family. The FDA is working on getting a black box warning on this drug or banning it. If your father's blood is bright red, then it is coming from the colon, which can be polyps, fissures, or hemmorhoids.