Minoz is the brand name of a medicine called minocycline (a member of the tetracycline group of antibiotics). Minocycline is also sold under the brand name of Cynomycin. It is an antibiotic and not a contraceptive pill.
Other antibiotics are also used in acne such as erythromycin, clindamycin, tetracycline. These can also be used either by application on the skin or by mouth.
Minoz is not a contraceptive. Contraceptive pills are not indicated in the treatment of acne though cyproterone (an anti-androgen) with oestrogen (a female hormone) is used in some very severe cases that do not respond to conventional therapies. It is sold under the brand name of Diane-35.