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BIMM118<br />

H1-Antagonists (“Antihistamines”)<br />

Second generation drugs:<br />

• Loratadine (Claritin®):<br />

– Does not enter CNS => NO drowsiness!<br />

– t1/2=8h => Active metabolite: Desloratadine (t1/2=28h)<br />

• Desloratadine (Clarinex®):<br />

• Fexofenadine (Allegra®):<br />

– Highly selective for H1-Receptor<br />

– $ 2B in sales/year !!

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