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 Symptoms & Treatment. Lactose is a sugar found in milk and milk products. Lactose intolerance occurs when the small intestine does not produce enough of the lactase enzyme, which breaks down lactose into two simpler sugars that the body then absorbs into the bloodstream.