Do not use if you are hypersensitive to any of its ingredients. In very rare cases, adverse reactions such as hypersensitivity, eye stinging, excessive tearing, eye pain, feeling of a foreign body in the eye, or other temporary eye irritations have been reported, which disappeared upon discontinuation of use of the product. Temporary blurred vision may occur after application of HYLO GEL®. In very rare cases, this may cause temporary headaches in sensitive patients.