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First-generation antihistamines can easily cross the blood-brain barrier into the central nervous system to reach the H-1 receptors within, often causing drowsiness. [7] Second-generation antihistamines selectively bind to the peripheral H-1 receptors outside the blood-brain barrier, therefore they are less likely to cause sedation.
10. You're taking medications that cause weight gain "Certain medications can induce weight gain or hinder weight loss by altering hormones, changing appetite, or causing water retention," says Costa.
The extent of vasoconstriction may be slight or severe depending on the substance or circumstance. Many vasoconstrictors also cause pupil dilation. Medications that cause vasoconstriction include: antihistamines, decongestants, and stimulants. Severe vasoconstriction may result in symptoms of intermittent claudication. [1]
The menstrual cycle can cause fluctuations in estrogen, which can cause water retention, Johnson notes. Pregnancy also causes the body to hold onto excess fluids and swell, says Badgett.
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]
Hydroxyzine, sold under the brand names Atarax and Vistaril among others, is an antihistamine medication. [8] It is used in the treatment of itchiness, anxiety, insomnia, and nausea (including that due to motion sickness). [8]
Infrequent adverse effects include urinary retention, palpitations, hypotension, headache, hallucination, psychosis and erectile dysfunction. [4] [6] [7] The newer, second-generation H 1-antihistamines are far more selective for peripheral histamine H 1-receptors and have a better tolerability profile compared to the first-generation agents ...
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.
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