Benadryl, or diphenhydramine, is commonly used to treat allergic reactions such as hay fever, runny nose and water eyes, according to Drugs.com. Benadryl belongs to a class of drugs called antihistamines. Antihistamines stop the body from over-producing histamine. Histamine is released by the immune system when it doesn't recognize a particular substanc,e such as pet dander or pollen. The higher levels of histamine in the body cause the common allergic symptoms. Benadryl has several potential side effects.
Drowsiness
The most common side effect of Benadryl is drowsiness. Benadryl is considered a first-generation antihistamine. First-generation antihistamines are noted for their ability to make a person feel sleepy. Benadryl affects the area of the brain that monitors nausea, according to Familydoctor.org. This function in the brain can cause a person to feel drowsy. It is not advisable for a person taking Benadryl to drive or operate machinery. Benadryl can also make it difficult for a person to think clearly. The drowsiness may wear off with constant use.
Nausea
Nausea is another common side effect of Benadryl. Nausea can lead to vomiting and dizziness. A person with a decreased appetite and gastrointestinal signs such as diarrhea or constipation should contact her doctor.
Allergic Reaction
An allergic reaction to Benadryl is possible and may cause serious complications. Drugs.com instructs users to stop using Benadryl if they experience symptoms such as difficulty breathing; swelling of the throat; wheezing; swollen lips, face or tongue; or an outbreak of hives. These can all be signs that a person is allergic to the active ingredient in Benadryl.
Serious Side Effects
It is rare for a person to experience serious side effects but it is important for a person to know what to watch for. Most serious side effects are found in toddlers or elderly people. A person should always to talk to his doctor before using Benadryl. Some of the most common serious side effects are hypotension, rapid heart rate, heart palpitations, mental confusion, vision distortion, loss of hearing, ringing in the ears, loss of balance, anemia, irregular heartbeat, seizures, enlarged prostrate and delirium, according to emedtv.com. This is not a comprehensive list of serious side effects. Other serious symptoms may develop. A person should contact a doctor with any questions or concerns.
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