Can you give a child cough medicine if they are taking Zyrtec?

It's generally advisable to consult a healthcare professional before giving a child cough medicine if they are already taking Zyrtec (cetirizine). Both medications can cause drowsiness, and combining them may increase this effect. Additionally, some cough medicines may contain antihistamines, which could lead to an overdose of such ingredients. Always check with a doctor or pharmacist for safe medication combinations for children.