Treatments include antihistamines, decongestants, eye drops and nasal sprays amongst others. If ignored, allergic rhinitis can lead to nasal polyps, sinusitis, and conjunctivitis and asthma complications.
There are a lot of ways how to overcome a runny nose. I recommend to read this article first https://heeats.com/runny-nose-and-its-treatment/ to know the reasons and different types of runny nose in order to choose the best medicine that suits you perfectly.
Be healthy!