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| {{drugbox
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| | IUPAC_name = 4-[(4-chlorophenyl)methyl]-2- (1-methylazepan-4-yl)-phthalazin-1-one
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| | image = Azelastine.png
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| | CAS_number = 58581-89-8
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| | ATC_prefix = R01
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| | ATC_suffix = AC03
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| | ATC_supplemental = {{ATC|R06|AX19}}, {{ATC|S01|GX07}}
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| | PubChem = 2267
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| | DrugBank = APRD00813
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| | C=22 | H=24 | Cl=1 | N=3 | O=1
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| | molecular_weight = 381.898 g/mol
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| | bioavailability = 40% (intranasal)
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| | protein_bound =
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| | metabolism =
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| | elimination_half-life = 22 hours
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| | pregnancy_category =
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| | pregnancy_US = C
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| | legal_status =
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| | routes_of_administration = intranasal, ocular
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| }}
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| '''Azelastine''' is an [[antihistamine]] and [[mast cell stabilizer]] available as a nasal spray (Astelin®) for [[hay fever]] and as [[eye drop]]s (Optivar®) for [[allergic conjunctivitis]].
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| ==Side effects==
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| ===Nasal spray===
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| Side effects of azelastine nasal spray vary somewhat depending on the condition being treated. The most common side effects include bitter taste, headache, [[rhinitis]], nose bleed, and [[somnolence]]. Adults being treated for [[vasomotor rhinitis]] may also experience [[dysesthesia]] and [[sinusitis]]. Additional side effects experienced by adults being treated for seasonal allergies include nasal burning, [[pharyngitis]], dry mouth, [[paroxysmal]] sneezing, nausea, fatigue, dizziness, and weight gain.<ref>[http://www.astelin.com/Astelin.Public/WebContent/en-US/pdf/ASTELIN_PI.pdf Astelin prescribing information]</ref>
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| ==External links==
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| *[http://www.astelin.com Official Astelin Website]
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| *[http://www.optivar.com Official Optivar Website]
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| *[http://www.medpointepharma.com Manufacturer's Website]
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| ==References==
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| <references/>
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| {{Nasal preparations}}
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| {{Antihistamines}}
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| [[Category:Antihistamines]]
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| {{molecular-cell-biology-stub}}
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| {{pharm-stub}}
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| [[pl:Azelastyna]]
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