These are aqueous solutions of drops that are instilled into the nose with a dropper. Oily vehicle is not preferable because it will inhibit the movement of cilia in the nasal mucosa. Nasal drops should be isotonic, should have neutral pH and viscosity similar to nasal secretions. This can be achieved by using 0.9% sodium chloride and 0.5% methyl cellulose. Nasal drops are dispensed in colored fluted bottles fitted with a dropper or in a suitable plastic container. The label should state “For external use only.”