It complete;y depends on why you get acne and what type of acne it is hun. Visit your gp though as they can prescribe you something to help. I suffer from a hormone imbalance which causes my acne so I take tablets and have done since I was 18. Sometimes a particular scrub, wash or cream may help.
The other route you can go down is going to a salon or dermatologist to use a specialised product line, such as dermalogica or nimue who both do acne products. I use dermalogica, but only the wash as if I use the cream, gel and moisturiser aswell it dries my skin out too much.