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Cetirizine is rapidly and extensively absorbed upon oral administration in tablet or syrup form. [3] The oral bioavailability of cetirizine is at least 70% and of levocetirizine is at least 85%. [1] The T max of cetirizine is approximately 1.0 hour regardless of formulation. [2]
Cold medicines are a group of medications taken individually or in combination as a treatment for the symptoms of the common cold and similar conditions of the upper respiratory tract. The term encompasses a broad array of drugs, including analgesics , antihistamines and decongestants , among many others.
Zyrtec-D, an example of combination therapy. Combination therapy with antihistamines. Antihistamines and decongestants can be used as a combination to treat nasal congestion, runny nose, and sneezing symptoms caused by common cold and hay fever. Some examples include: Pseudoephedrine + Loratadine (Claritin-D®) Pseudoephedrine + Cetirizine
Levocetirizine is an antihistamine. It acts as an inverse agonist that decreases activity at histamine H1 receptors. This in turn prevents the release of other allergy chemicals and increases the blood supply to the area, providing relief from the typical symptoms of hay fever.
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]
Cetirizine/pseudoephedrine (Zyrtec-D) is an antihistamine and decongestant formulation. It is a fixed-dose combination drug containing 5 mg cetirizine hydrochloride and 120 mg pseudoephedrine hydrochloride for symptoms related to seasonal allergic rhinitis .