Since you also take Coumadin for DVT it's likely best if you consult your gastro before adding other UC meds. Also, since you do take a full daily dose of Colazal, I would imagine you might benefit from an occasional mesalamine enema supplement-- maybe once a week for a few times to see if it rids you of urgency-- not any frequent application because the 5-ASA enemas tend to liquify bms. Then, too, mesalamine enemas contain sufites as a preservative so you may want to beware of that if you have known sensitivities. Another possibility for reducing urgency is to beware of caffeine consumption-- it can overstimulate the colon. You might do better having decaf coffee or tea before your morning commute if you've been drinking regular. / Old Hat (nearly 30 yrs with left-sided UC ... [etc.])