Do not use if allergic to any ingredient, including sorbic acid. Transient contact urticaria (temporary red wheals or streaks on the skin) may occur from use of this product. To avoid contamination, do not touch dropper tip to any surface. Cap should be replaced after every use. Problems with contact lenses and lens care products could result in serious injury to the eye. It is essential that you follow your eye care professional's direction and all labeling instructions for proper use of your lenses and lens care products. Eye problems, including corneal ulcers, can develop rapidly and lead to loss of vision; Therefore, if you experience eye discomfort, excessive tearing, vision changes, and/or redness of the eye, immediately remove your lenses and promptly contact your eye care professional.