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Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. [1] Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects. [1]
Other common side effects for all generations include gastrointestinal side effects, headaches and tiredness. [9] Antihistamines are generally safe to use during pregnancy with second-generation antihistamines being more preferred due to their lack of sedation. [10]
The most common adverse effect is sedation; this "side-effect" is utilized in many OTC sleeping-aid preparations. Other common adverse effects in first-generation H 1 -antihistamines include dizziness, tinnitus , blurred vision, euphoria , incoordination, anxiety , increased appetite leading to weight gain , insomnia , tremor, nausea and ...
Hydroxyzine works by blocking the effects of histamine. [9] It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]
Effects generally begin within thirty minutes and last for about a day. [6] The degree of benefit is similar to other antihistamines such as diphenhydramine, which is a first-generation antihistamine. [6] Common side effects include sleepiness, dry mouth, headache, and abdominal pain. [6]
Serious side effects are rare and include allergic reactions, seizures, and liver problems. [6] Use during pregnancy appears to be safe but has not been well studied. [7] It is not recommended in children less than two years old. [6] It is in the second-generation antihistamine family of medications. [5]
The most prominent side effects are dizziness and sleepiness. [42] Diphenhydramine is a potent anticholinergic agent and potential deliriant in higher doses. This activity is responsible for the side effects of dry mouth and throat, increased heart rate, pupil dilation, urinary retention, constipation, and, at high doses, hallucinations or ...
Benadryl Allergy is the name of a Benadryl product found in the United States and Canada. It is an antihistamine drug used to relieve allergies. Its active ingredient is diphenhydramine, a first-generation antihistamine. It is known to be sedative, making drowsiness a common side effect.
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