Whether your nasal congestion comes from a cold or allergies, Claritin-D works! Get up to 12 hours of relief from your allergy symptoms, including nasal congestion and sinus pressure. Ask for it at the pharmacy counter. Works as hard on cold congestion as it does on allergy congestion. #1 pharmacist recommended adult multi-symptom allergy product. Temporarily relieves common allergy symptoms, plus nasal congestion due to cold or allergy.