I took bactrim (sulfamethoxazole and trimethoprim) for acne and it cleared up my acne completely, but i got allergic to it. is there an acne antibiotic substitute that is as effective?

Some good choices: One tip is never to use JUST an antibiotic if you want a stable remission while taking the medicine -- always add a topical such as benzoyl peroxide or retinoic acid. Topical clindamycin with this regimen may be sufficient; systemic tetracycline is inexpensive and reliable.

Discuss with derm: Yes there are alternative therapies such as doxycyline, coral actives - a non antibiotic, and others. your dermatologist can discuss alternatives.

There are others : There are several antibiotics that can be used to treat acne aside from the one you have become allergic to. Acne treatment regimens can be tailored by your primary doctor or dermatologist.