One of the most important reactions to recognize is angioedema.
Rarely, losartan has been associated with swelling involving the face, lips, tongue, throat, or airway.
### When swelling is an emergency
Get emergency medical help immediately if swelling affects your:
* face
* lips
* tongue
* throat
especially if you also have difficulty breathing or swallowing.
Angioedema can obstruct the airway and requires urgent medical attention.
## Other Serious Symptoms You Should Not Ignore
