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Adverse drug reactions are most commonly associated with the first-generation H 1-antihistamines. This is due to their relative lack of selectivity for the H 1-receptor and their ability to cross the blood–brain barrier. The most common adverse effect is sedation; this "side-effect" is utilized in many OTC sleeping-aid
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]
It is a first-generation H 1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects. [11] [2] Diphenhydramine is also a potent anticholinergic. [12] It is mainly used to treat allergies, insomnia, and symptoms of the common cold.
“This is a second-generation antihistamine, which is less sedating than the first-generation antihistamines like Benadryl,” says Shaan Waqar, ... Zyrtec comes with a risk of side effects ...
Doxylamine and other first-generation antihistamines are the most widely used sleep medications in the world. [6] Typical side effects of doxylamine (at recommended doses) include dizziness, drowsiness, grogginess, and dry mouth, among others. [7] [4] As an antihistamine, doxylamine is an inverse agonist of the histamine H 1 receptor.
Clemastine, also known as meclastin, is a first-generation H1 histamine antagonist (antihistamine) with anticholinergic properties (drying) and sedative side effects. [1] Like all first-generation antihistamines, it is sedating. [2] [3] Patented in 1960, it came into medical use in 1967. [4]
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 medication takes effect within two hours and lasts for about 4–6 hours. [2] It is a first-generation antihistamine and works by blocking the histamine H 1 receptor. [2] Common side effects include sleepiness, restlessness, and weakness. Other side effects may include dry mouth and wheeziness. [2]