 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  pets. Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.The uses of Wal-Zyr (Ketotifen) Ophthalmic (Eye): This medication is used to prevent and treat itching of the eyes caused by allergies (allergic/seasonal conjunctivitis). Ketotifen is an antihistamine for the eye that treats allergic symptoms by blocking a certain natural substance (histamine). It is also a mast cell stabilizer that prevents allergic reactions by reducing the release of natural substances that cause an allergic reaction. How to use Wal-Zyr Drops If you are using the over-the-counter product, read all directions on the product package before using this medication. If your doctor has prescribed this medication, use it exactly as directed. Apply 1 drop to the affected eye(s) as directed by the package instructions or your doctor, usually twice a day (every 8 to 12 hours). Dosage is based on your medical condition and response to treatment. To apply eye drops, wash your hands first. To avoid contamination, do not touch the dropper tip or let </s>