treatment of acne depends on the stage and severity of the condition.
very good results can be obtained if you are under regular treatment- the duration of the treatment lasting from 6-9 months.
the problem of relapse occurs because most of the times either the medicines are not applied properly or not applied for the needed duration or the treatment is stopped midway or irregular.
More than antibiotics for prolonged duration what is needed is topical retinoids for six to nine months

please visit the nearest dermat who will decide the stage and chalk out a management plan for you.
also one thing you need to strictly follow is that you need to continue the medicines for atleast 6-9 months if you want to get rid of acne for quite a long long duration.

regards
Dr amit

Treatment of acne would be oral medication,  creams and daily skin care routine which further helps in acne. Oral medication will be tablet azithromycin 500 mg once a day for three days in a week for 4 weeks. Creams would be application of clindamycin gel twice a day only on the Pimples. Application of benzoyl peroxide 2.5% gel once a day on the Pimples. Application of Retin A cream 0.025% on full face at night for 2 hrs.All the applications will have to be done for 6 weeks.All these medications will require a prescription from your GP.you need to follow a routine of cleansing, sunscreen , creams daily.cleanse your face with cetaphil cleansing lotion for acne prone skin twice daily.sunscreen needs to be used daily , neutrogena would be a good choice. Also please use a salicylic acid face wash once a day.