Consistently used blue pen syrup

Blue Pen Syrup, which has been familiar to me through impactful advertisements featuring pretty children since I was very young. I keep it as an emergency supply at home because I still don't feel completely safe from COVID-19 and the flu. Since it's a syrup, children can take it comfortably, and it works well with children. I think it's also convenient to give alongside medications prepared at the hospital. I hope I don't get sick during these times.