 <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]  antihistamines applied to the skin (such as diphenhydramine cream, ointment, spray) because increased side effects may occur. Cetirizine is very similar to hydroxyzine and levocetirizine. Do not use these medications while using cetirizine. This medication may interfere with certain lab tests (such as allergy skin testing), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug. Does Wal-Zyr D interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Wal-Zyr D Oral: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe drowsiness, fast/irregular heartbeat, mental/mood changes (such as anxiety, restlessness), seizures.  Notes Keep all medical and lab appointments.  Missed Dose If you miss a dose, take it as soon as you remember. </s>