Optive Plus  has a unique triple-action formula that provides long lasting comfort. Optive Plus lubricates the surface of the eye and moisturises the ocular surface cells by restoring osmotic balance plus protecting your natural tears with a lipid enhancement. Description: Optive Plus is a multi-dose sterile solution which contains sodium carboxymethylcellulose 0.5%, glycerine 1.0%, castor oil 0.25%, polysorbate 80 0.5%, levocarnitine 0.25% and erythritol 0.25%, preserved with Purite 0.01% which breaks down into natural tear components in the eye. Date of publication of this package insert: March 2012 How supplied: Optive Plus is supplied in plastic bottles containing 3 ml or 10 ml. Optive Plus is preserved with Purite a preservative in the bottle which breaks down into natural tear components on the eye.