<qa>  What is the cause of tear production in patients with keratoconjunctivitRestasis is indicated to increase tear production in patients whose tear production is presumed to be suppressed due to ocular inflammation associated with a condition called keratoconjunctivitis sicca. The relief of dry eye signs and symptoms with Restasis therapy is often delayed by 1 to 6 months from the initiation of therapy. Stinging on installation, particularly when initiating therapy, has been reported. 