Discontinue treatment if hypersensitivity reaction occur. May cause punctate &/or toxic ulcerative keratopathy. Closely monitor frequent or prolonged use in dry eye patients, or w/ sensitive corneal conditions. Advise patient not to wear contact lenses if the eye is red. Not to be used to treat contact lenses-related irritation. Benzalkonium Cl may be absorbed by contact lenses. Patients who wear contact lenses & whose eyes are not red should wait at least 10 min after instilling the drug prior to insertion of their contact lenses. Avoid long-term use; may cause superinfection. Not to be used during pregnancy. Discontinue use during lactation.