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.
Best Answer: A stomach bug's symptoms will appear in 12-72 hours (normally within 48 hours) so if you don't have it after three days, you are in the clear. Stomach bugs are really fast moving so you don't have to worry about it for long.