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The unbound or free fraction of levocetirizine has been reported to be 8%. [1] The true volume of distribution of cetirizine is unknown but is estimated to be 0.3 to 0.45 L/kg. [3] [1] Cetirizine poorly and slowly crosses the blood–brain barrier, which is thought to be due to its chemical properties and its activity as a P-glycoprotein substrate.
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 .
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.
Bilastine is an antihistamine medication used to treat hives (), allergic rhinitis and itchy inflamed eyes (allergic conjunctivitis) caused by an allergy. [6] It is a second-generation antihistamine and takes effect by selectively inhibiting the histamine H 1 receptor, preventing these allergic reactions. [7]
All Bulgarian online pharmacies must be registered with the Bulgarian Drug Agency (BDA), which controls the medicine trade and reviews when there is doubt in drug quality and safety. A special BDA logo and a certificate for registration of pharmacy prove the accreditation and the legitimacy of the store.
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No over-the-counter cough medicines have been found to be effective in cases of pneumonia. [9] They are not recommended in those who have COPD, chronic bronchitis, or the common cold. [10] [2] There is not enough evidence to make recommendations for those who have a cough in cancer. [11]