TheraTears in preservative-free single-use containers is designed to saturate dry eyes, providing the dosing that is ideal for very dry eyes. TheraTears comes in a foil pouch to ensure that it is as fresh as natural tears. For temporary relief of burning, irritation, and discomfort including exposure to wind or sun. Active ingredient: sodium carboxymethylcellulose 0.25%. Inactive ingredient: borate buffers, calcium chloride, magnesium chloride, potassium chloride, purified water, sodium bicarbonate, sodium chloride and sodium phosphate.