AY 25674 is an orally active antiallergic agent and a PDE inhibitor. AY 25674 inhibits the release of allergic histamine from mast cells. AY 25674 suppresses passive anaphylaxis induced by reaginic (IgE) antibodies. AY 25674 does not inhibit the increased vascular permeability caused by non-reaginic antibodies, serotonin or histamine. AY 25674 reaches its peak activity shortly after administration; rapid tolerance occurs at high doses. AY 25674 can be used in research related to passive anaphylaxis.

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.