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.
Recognizing the Symptoms of Lactose Intolerance. 1  1. Pay attention to GI symptoms. 2  2. Try to link your symptoms with consuming dairy products. 3  3. Distinguish between lactose intolerance and a milk allergy.  4. Realize how lactose intolerance is linked to ethnicity.