Budesonide S isomer, also known as S-formoterol, is a medication utilized in the treatment of various respiratory conditions, predominantly asthma and chronic obstructive pulmonary disease (COPD). This potent bronchodilator works by relaxing the muscles of the airways, thus allowing easier breathing. Synonyms for Budesonide S isomer include: formoterol, formoterol fumarate, arformoterol, eformoterol, and levosalbutamol. These interchangeable terms refer to similar compounds or generic variations of Budesonide S isomer, used to alleviate breathing difficulties and manage asthma symptoms. Consultation with a healthcare professional is necessary to determine the appropriate medication and dosage for individual patients.