SIDE EFFECTS: Dry lips and mouth, minor swelling of the eyelids or lips, crusty skin, nosebleeds, upset stomach, or thinning of hair may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Duration of stomach flu depends on the severity of the attack. The condition may become worse in case of infants, young children and elderly who cannot drink sufficient fluids to compensate for dehydration experienced during the illness. For these people, stomach flu can last for 3 weeks or more.
Stomach Flu / Stomach Bug Symptoms. The stomach flu is different from the regular flu as it only affects your digestive system. Generally, the stomach flu will last only a few days, but can have symptoms last as long as 10 days. 1  Watery stool. 2  Abdominal cramps. 3  Nausea. 4  Vomiting.