Decozal 0.1% Nasal Drops are nasal decongestant drops containing xylometazoline hydrochloride. It is used for the short term relief of nasal congestion and blocked nose associated with conditions such as common cold, sinus congestion, or allergic rhinitis when recommended by a doctor or pharmacist. Xylometazoline works by narrowing the blood vessels in the nasal lining, which helps reduce swelling and open the nasal passages. These drops are for nasal use only and should be used for a limited duration, as prolonged or frequent use may cause rebound congestion or nasal irritation. Possible side effects may include nasal dryness, burning sensation, sneezing, irritation, headache, nausea, or temporary discomfort in the nose. These are not all the possible side effects. Talk to your healthcare provider if symptoms persist, worsen, or if any side effect bothers you.