Phenoterol is primarily used as a bronchodilator in the treatment of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It works by relaxing the muscles in the airways, making it easier to breathe. This medication is often administered via inhalation to provide quick relief from symptoms like wheezing, shortness of breath, and chest tightness. In some cases, it may also be used to manage bronchospasm during anesthesia. Phenoterol is particularly effective in acute asthma attacks due to its rapid onset of action. However, it should be used with caution, especially in patients with cardiovascular conditions, as it can cause side effects like increased heart rate and tremors. Always follow medical guidance for proper dosage and administration.