Desmethylazelastine is a main active metabolite of Azelastine that is oxidatively metabolized by the cytochrome P450 enzyme system with a protein binding rate of 97% and an elimination half-life of 54 hours. Azelastine is an orally active, selective and high-affinity histamine H1-receptor antagonist. Azelastine can be used in studies of allergic rhinitis, asthma, diabetic hyperlipidemic and SARS-CoV-2.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.