Final answer:
Ventolin, also known as albuterol, is the medication used as a rescue inhaler for immediate relief of asthma symptoms.
Step-by-step explanation:
The medication used as a rescue inhaler for immediate relief of asthma symptoms is Ventolin. Ventolin, also known as albuterol, is a short-acting bronchodilator that helps relax the muscles in the airways, allowing them to open up for easier breathing. It is typically administered via an inhaler, which delivers the medication directly to the lungs.