Anti-Allergic Agents Market Size and Forecasts (2020 - 2030), Global and Regional Share, Trends, and Growth Opportunity Analysis Report Coverage: By Type (Eye Allergy, Skin Allergy, Food Allergy, Asthma, Rhinitis, Others); Treatment (Anti-Allergy Drugs, Immunotherapy, Antihistamines); Dosage form (Oral, Inhalers, Intranasal, Others); Distribution Channel (Hospital Pharmacies, Retail Pharmacies, Online Retailers, Others) , and Geography (North America, Europe, Asia Pacific, and South and Central America)