I am already on acne antibiotic gels, i would like to know of a medicine to use on already started pimples, to reduce them (apart from preventing).

Add another Rx: Many men do not get adequate relief from an antibiotic gel. It may be time to talk with your physician about a systemic antibiotic, or if you're ready for a medication such as Accutane which is extremely effective but rather unpleasant and a bit risky, now's the time to make this known. This is the 21st century and we can clear you up if that's your wish.