When a person becomes infected with a norovirus, the virus begins to multiply within the small intestine. After approximately 1 to 2 days, norovirus symptoms can begin. This period between the norovirus transmission and the start of symptoms is the  norovirus incubation period ..In some cases, the norovirus incubation period can be as short as 12 hours.his period between the norovirus transmission and the start of symptoms is the  norovirus incubation period .. In some cases, the norovirus incubation period can be as short as 12 hours.
Drug type: Fluorouracil is an anti-cancer (antineoplastic or cytotoxic) chemotherapy drug. Fluorouracil is classified as an antimetabolite.. (For more detail, see How Fluorouracil Works section below). What Fluorouracil Is Used For: 1  Colon and rectal cancer. 2  Breast cancer.
Important things to remember about the side effects of Fluorouracil: Most people do not experience all of the side effects of Fluorouracil listed. Fluorouracil side effects are often predictable in terms of their onset duration and severity. Fluorouracil side effects will improve after therapy is complete Fluorouracil side effects may be quite manageable. There are many options to minimize or prevent the side effects of Fluorouracil. The following side effects are common (occurring in greater than 30%) for patients taking Fluorouracil: Diarrhea. Nausea and possible occasional vomiting. Mouth sores. Poor appetite. Watery eyes, sensitivity to light (photophobia) Taste changes, metallic taste in mouth during infusion.