Hi, Antibiotics typically do not directly affect the menstrual cycle. However, they can indirectly affect the menstrual cycle by causing changes in the body s natural bacterial balance, which can lead to yeast infections or other types of infections that may affect the menstrual cycle. Additionally, if the antibiotic is taken with birth control pills, it can decrease the effectiveness of the pills, which can result in a delay or irregularity of the menstrual cycle. In your case, the antibiotic you took for laryngitis may have affected your body in some way, leading to a delay in your menstrual cycle. However, it s also possible that other factors, such as stress or changes in weight or exercise habits, may be contributing to the delay. It s generally a good idea to consult with your healthcare provider if you experience a significant delay in your menstrual cycle, especially if it s more than a week or two late. Your healthcare provider can help determine the underlying cause of the delay and recommend appropriate treatment or further testing if necessary. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician