Phenylephrine Hydrochloride and Chlorpheniramine Maleate Drops - #18507

I recently heard about phenylephrine hydrochloride and chlorpheniramine maleate drops, and I want to understand what they are used for, their side effects, and whether Ayurveda offers natural alternatives for congestion and allergies. From what I read, phenylephrine hydrochloride is a decongestant that shrinks blood vessels in the nasal passages, while chlorpheniramine maleate is an antihistamine that helps reduce allergy symptoms like sneezing, runny nose, and itching. These drops are commonly used for cold, sinus infections, hay fever, and allergic rhinitis. However, frequent use can cause dryness, drowsiness, dizziness, and even rebound congestion. I do not have severe nasal congestion, but I sometimes experience mild stuffiness, occasional sneezing, and sinus pressure, especially after exposure to dust, strong smells, or weather changes—could these be early signs of allergic rhinitis or sinus inflammation? Does Ayurveda classify nasal congestion and allergies as a Kapha or Pitta imbalance, and what are the best natural ways to relieve congestion and allergy symptoms without relying on medicated drops? Additionally, I want to know whether diet and immunity levels play a role in preventing nasal allergies and congestion. I consume a lot of dairy and fried foods, and I have read that certain foods can increase mucus production and worsen congestion—could my eating habits be aggravating my nasal symptoms? Does Ayurveda recommend specific herbs, nasal cleansing techniques, or dietary modifications to improve respiratory health and prevent frequent congestion? I have read that Tulsi, Mulethi (licorice), and Sitopaladi Churna are beneficial for clearing mucus, soothing inflammation, and boosting immunity—would these help in naturally managing congestion and allergies? Are there any Ayurvedic nasal drops, herbal teas, or steam inhalation techniques that can help in preventing nasal congestion and improving sinus health naturally? Since I prefer natural respiratory health solutions, I am looking for Ayurvedic treatments that can relieve congestion, support allergy management, and improve nasal health naturally. Please provide detailed Ayurvedic insights on phenylephrine hydrochloride and chlorpheniramine maleate drops, their uses, and Ayurvedic approaches to nasal congestion.