Antibiotics are a large class of drugs that are mainly used for the treatment of various bacterial infections. There are many different types of antibiotics, and the effect of taking antibiotics on a woman’s menstrual period is uncertain. Some antibiotics may cause a woman’s period to be delayed after taking them, but most antibiotics do not have this adverse effect. Any antibiotic that affects the endocrine function may delay a woman’s period, but most of them are caused by the patient’s own illness, not the antibiotic itself. The most common reasons for delayed menstruation are the patient’s illness, not the antibiotics themselves. Staying up late, irregular work and rest, excessive dieting, overeating, excessive stress, significant mood swings, tobacco and alcohol stimulation may all delay or not come. Especially if you have had regular menstrual cycles in the past and if you have a normal sexual life, you should consider the possibility of pregnancy when your period is delayed and does not come.