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 is characterized by the symptoms that occur when your body does not make enough of a digestive enzyme called lactase to digest a sugar called lactose, which is found mainly in milk and other dairy products.actose intolerance is characterized by the symptoms that occur when your body does not make enough of a digestive enzyme called lactase to digest a sugar called lactose, which is found mainly in milk and other dairy products.