FDA green lights AstraZeneca's asthma drug Fasenra for self-administration

British drugmaker AstraZeneca said on Friday that the U.S. Food and Drug Administration (FDA) has approved self-administration of its asthma treatment Fasenra which uses a pre-filled, single-use auto-injector pen.

The move is a boost for the drugmaker's respiratory portfolio after the regulator earlier this week declined to approve AstraZeneca's combination therapy to treat smoker's lung, as it tries to catch up with domestic rival GlaxoSmithKline.