Azithromycin over the counter is an antibiotic used to treat a variety of bacterial infections. It is commonly prescribed for conditions such as respiratory infections (like pneumonia and bronchitis), skin infections, ear infections, and sexually transmitted infections (such as chlamydia and gonorrhea). Azithromycin works by inhibiting the growth of bacteria, preventing them from reproducing and spreading. It is also used to treat sinus infections, strep throat, and tonsillitis. Azithromycin is often favored due to its long half-life, allowing for shorter treatment courses. However, it is not effective against viral infections like the flu or common cold.