Guano, Histoplasmosis, and Our Service. Large accumulations of guano sometimes breeds a fungus called Histoplasmosis (see article, Is Bat Guano Dangerous?). This fungus can infect an eye or a lung, and in a serious case, you can lose your eye or lung to this infection.
Cromolyn sodium and nedocromil are prescribed as aerosols in metered dose inhalers (MDIs). Generally, you'll need to take either drug four times a day, but nedocromil has also been effective in a twice-per-day dose.
To prevent bronchial asthma attacks, cromolyn sodium inhalation is usually given 4 times daily. If you are using cromolyn sodium inhalation to prevent asthma caused by exercise, air pollutants, or exposure to chemicals, use the medicine 10 to 15 minutes (but not more than 1 hour) before exercising or exposure.