Thera Tears in preservative-free single-use containers is designed to saturate dry eyes providing the dosing that is ideal for very dry eyes. Thera Tears 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 carboxymethyl cellulose 0.25. Inactive ingredient borate buffers calcium chloride magnesium chloride potassium chloride purified water sodium bicarbonate sodium chloride and sodium phosphate.