Physiologic Seawater Nasal Spray is relatively safe for proper use and is generally harmless. Physiological Sea Water Nasal Spray is used to improve the symptoms caused by acute, chronic, dry, atrophic, allergic rhinitis, asthma and post nasal surgery, and to restore nasal function. Physiological seawater nasal spray is a kind of nasal care liquid, which does not contain antibiotics, hormones, nor vasoconstrictors and other ingredients, and is less irritating to the nasal mucosa, after using it, it is mainly designed to remove the secretions in the nasal cavity, so as to make the nose remain open, while some electrolyte components in it can effectively nourish the nasal mucosa and play a certain restorative role. As long as the ingredients are not allergic to them, there is generally no harm. But also need to point out is that physiological seawater nasal spray is only auxiliary treatment, for some nasal problems, but also need to be combined with other treatment methods, such as sinusitis also need to be combined with anti-inflammatory treatment. It is recommended to use Physiologic Seawater Nasal Spray under the guidance of a doctor. It should not be used by people who are allergic to this product.