A bronchodilator medication that opens up the airways by soothing the muscles all over airways which could tighten up during an asthma assault or in COPD (chronic obstructive pulmonary condition). Beta-agonists could be administered by inhalers or by mouth. They are called "agonists" since they stimulate the beta-2 receptor from the muscles surrounding the airways. Activation of beta-2 receptors calms the muscles surrounding the airways and starts the airways. Dilating airways helps ease the outward symptoms of dyspnea (shortness of breath). Beta-2 agonists have been shown to relieve dyspnea in many symptoms of asthma and COPD customers. The action of beta-2 agonists starts within a few minutes after breathing and can last for about 4 hours. Because of their fast start of activity, beta-2 agonists are specially helpful for customers who're acutely in short supply of breath but, due to their quick duration of activity, several doses of beta-agonists are often needed each day. The side effects of beta-2 agonists consist of anxiety, tremor, palpitations or fast heartbeat, and reduced blood potassium.