DRUG CLASS AND MECHANISM: Diphenhydramine is an antihistamine used for treating allergic reactions. Histamine is released by the body during several types of allergic reactions and--to a lesser extent--during some viral infections, such as the common cold.
Symptoms Symptoms of lactose intolerance. The symptoms of lactose intolerance can occur after youâve eaten or drunk something that contains lactose. Symptoms of lactose intolerance may include: 1  feeling bloated. 2  pain or cramps in your tummy (abdomen). 3  diarrhoea. 4  wind. 5  feeling sick.
Lactose intolerance, the inability to digest the sugars in milk, is the most common. 1  How long diarrhea lasts: More than 4 weeks. 2  Triggered by: A specific food. 3  Symptoms appear within: 2 to 12 hours.  Appearance: Watery, sometimes contains 1  mucous. Other symptoms: Gassiness, abdominal cramps or pain.