You can, and these are ranked in no particular order,...
1) Go cold turkey. Expect three or more days of intense hell, a bad upset stomach
, headache, body aches, restless leg, little sleep, etc. This may be the quickest, but the hardest.
2). Tapering. Take less and less per day, till you are down to just half a pill or so a day. I still believe you will have some withdrawals, but probably not as bad. I can't do this as I don't have the willpower. If I have them, I take them.