Indanazoline is primarily used as a nasal decongestant due to its vasoconstrictive properties. It works by narrowing the blood vessels in the nasal passages, reducing swelling and congestion, and making it easier to breathe. This makes it effective in providing relief from symptoms associated with conditions like the common cold, sinusitis, or allergic rhinitis. It is often available in the form of nasal sprays or drops for direct application. However, it should be used cautiously and for short durations, as prolonged use can lead to rebound congestion or other side effects. Always follow recommended dosages and consult a healthcare professional if symptoms persist.