Abstract: A medicinal vial cover for preventing the introduction of a liquid solution to atmosphere during the removal of the solution from a container of the type having an axially-extending neck and an entrance opening coaxial with the neck in which the opening is sealed by a rubber plug through which a hypodermic needle is inserted to extract the solution into a syringe, the cover having a tip at one of its ends and a hollow base at its other end adapted to be attached over the neck of the container. A hypodermic needle can then be inserted through both the cover and the rubber plug to withdraw the solution into a syringe with any aerosol or droplets being trapped within the cover.