[1].Kristie E. N. Clarke.Can I give my 5-year-old over-the-counter cough medicine?2019.https://www.healthychildren.org/English/tips-tools/ask-the-pediatrician/Pages/Can-I-give-my-5-year-old-cough-medicine.aspx
[2].FDA.OTC Cough and Cold Products: Not For Infants and Children Under 2 Years of Age.2008.https://www.fda.gov/consumers/consumer-updates/otc-cough-and-cold-products-not-infants-and-children-under-2-years-age