Treatment of mold infection is by use of anti allergy medicines like benadryl, claritin, and zyrtec. Nasal sprays containing corticosteroids can also work. Over the counter nasal spray called cromolyn sodium can help to treat mold allergy. Use of decongestants like Actifed, Sudafed, and Drixoral are recommended. But you should make proper arrangements for ventilation and reduce moisture by stopping water leakage.