Azithromycin 500 mg is a widely used antibiotic that belongs to the macrolide class of medicines. It is commonly prescribed to treat a variety of bacterial infections in humans. Azithromycin works by stopping the growth of bacteria, helping the body’s immune system eliminate the infection. Doctors often prescribe Azithromycin 500 mg for respiratory tract infections such as bronchitis, pneumonia, sinusitis, and throat infections including tonsillitis and pharyngitis. It is also effective in treating ear infections, certain skin and soft tissue infections, and some sexually transmitted infections such as chlamydia. In some cases, it may be used for typhoid fever or traveler’s diarrhea caused by susceptible bacteria. The usual dosage and duration depend on the type and severity of the infection. Some conditions require a short course of three to five days, while others may need a longer treatment period. It is important to take the medication exactly as prescribed and complete the full course, even if symptoms improve early, to prevent antibiotic resistance. Azithromycin 500 mg should only be used under medical supervision. Possible side effects include nausea, diarrhea, abdominal pain, and headache. Serious side effects are rare but require immediate medical attention.