Vicks Sinex Micromist Nasal Spray is a nasal spray used for localised relief of the symptoms of a blocked nose in association with a cold, hayfever or sinusitis (inflammation of the passages leading to the nose). The effect of the spray starts after several minutes & lasts for 6-8 hours. The active substance is Oxymetazoline Hydrochloride. As an alternative, doctors can also prescribe medication that can assist with flu. Please visit our Online Doctor service to proceed with an influenza consultation. Our UK registered GP will review your details & if appropriate can provide a prescription for the main treatments for influenza. Click Here