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: there is no such thing a stomach bug, it is called a pathogen. and it depends greatly on the pathogen, it would very unlikely cause a reaction just overnight as well. Depends on the bug, sometimes it takes 24hours, sometimes just 2 hours, and it also depends on whether it was a bug. Could of been food poisoning.