Oxeon-P (oxymetazoline) is effective for short-term relief of nasal congestion in children due to colds, allergies, or sinusitis, but it is not advisable for long-term use. Prolonged or repeated use can cause rebound nasal congestion (rhinitis medicamentosa) and increase the risk of side effects. It should generally be used for only a few days (usually 3–5) at the recommended pediatric dose. If a child continues to need it, parents should stop the spray and consult a paediatrician or ENT specialist for safer, long-term treatment options.