I'm sorry to hear that your cold and runny nose symptoms have returned after taking Cetirizine. Cetirizine is an antihistamine that helps relieve allergy-related symptoms like runny nose and sneezing by blocking histamine, a chemical involved in allergic reactions. It can provide temporary relief, but if symptoms persist or return, it may indicate that the underlying cause needs further evaluation or additional treatment.

Here are a few points to consider:

• Cetirizine is effective mainly for allergy-related symptoms, so if your cold symptoms are due to a viral infection, it might not fully resolve them.
• Make sure to follow the dosage instructions exactly as prescribed.
• If you experience side effects such as drowsiness, headache, or dry mouth, inform your doctor.
• Persistent or worsening symptoms may require other treatments or investigations.

I recommend consulting an ear, nose, and throat (ENT) specialist or a general physician to assess your symptoms thoroughly and provide appropriate treatment. If you develop high fever, difficulty breathing, or severe discomfort, seek medical attention promptly.To narrow down potential causes, we will need some more information.Please tell me your age and gender. I understand you're dealing with a cold and runny nose, and that your symptoms returned even after taking Cetiriz.