Hi,
Welcome to HCM,
Benzaclin does not affect menstrual Cycle. Certain
Hormonal medications which we give along with Antibiotics, may affect the menstrual Cycle, if not taken as advised. As you have not mentioned about any other medicines except Benzaclin, we must look for other causes. As you are a young girl, and just started
menstruation one year back, with PMS, and having Acne, may be you have hormonal imbalance. You may observe your 2-3 cycles, and if irregularity continues, you must go to see your doctor, who will advise you to do Thyroid function test, Androgen profile,
Insulin level, and if needed also
Prolactin, FSH And LH levels. make sure that you are doing regular exercises, and not gaining weight. eat healthy food also.
Hope you got your answer.
take care.
Dr H Hamdani