benzoyl peroxide or topical retinoids combined with oral antibiotics (tetracyclines).
Isotretinoin is an option.
Severe inflammatory acne, nodular acne, acne resistant to the above treatments: isotretinoin also known as Accutane, can be prescribed by a doctor, or contraceptive pills with cyproterone for females with virilization or drospirenone.
http://en.wikipedia.org/wiki/Acne_vulgaris#Treatments
Let us know about how you are doing and what your doctor advises.