Nasal spray bottles are used to deliver medication directly into the nasal cavity for a variety of conditions, such as congestion from allergies, colds, or sinusitis. They can also be used to moisten dry nasal passages or administer systemic medications that are absorbed quickly through the nose. These bottles are often used to administer decongestants, saline solutions, or steroid nasal sprays, providing relief by reducing inflammation, clearing mucus, or delivering medicine for other systemic diseases.