It is quite common for antihistamines like Xyzal (levocetirizine) to dry out your nasal passages, which can sometimes trigger a nosebleed. Since Xyzal is primarily for allergies rather than a sore throat, it is perfectly safe and reasonable to temporarily stop taking it to let your nose heal. To help soothe your nasal passages, you can try using a simple saline nasal spray or a humidifier. Please rest assured that occasional nosebleeds are usually harmless, but if they become frequent, heavy, or if your sore throat worsens, please consult a healthcare professional.