Bronkaid is an over-the-counter medication that contains ephedrine sulfate and guaifenesin. It is commonly used as a bronchodilator to help relieve symptoms of asthma and bronchitis. Ephedrine works by relaxing the muscles in the airways, making it easier to breathe, while guaifenesin helps to thin and loosen mucus in the lungs. It is important to follow the recommended dosage and usage instructions when taking Bronkaid to avoid potential side effects and complications.