Delcon Plus DS Syrup Strawberry is a combination medicine primarily used in the treatment of allergic rhinitis and common cold. This medicine works by inhibiting the action of histamine, a chemical messenger responsible for causing allergies. It helps relieve congestion, sneezing, nasal and sinus congestion, and nasal swelling caused due to allergies. Common side effects include drowsiness, dizziness, headache, dry mouth/nose/throat, upset stomach, constipation, or trouble sleeping.