Azifast usuage

Patient: I am an Indian staying in Singapore. I am 25 and married. While I am away from doctors, I usually take azifast 500 when I get pimples for 3-5 days in a week. Could u please tell me for how many weeks max its adviced to take azifast and what should be the ideal gap if I wish to start it once again? Does it have any impact for future pregnancy which is planned after 6 months ?