Irritable Bowel Syndrome Treatment Market By Type IBS with Diarrhea (IBS-D), IBS with Constipation (IBS-C), Mixed IBS and others ,By Product Rifaximin, Eluxadoline, Lubiprostone, Linaclotide and Others , By End User Hospitals Pharmacies, Drug Stores & Retail Pharmacies and Online Pharmacies : Market Research Report 2021 Covid 19 Impact Outlook, Regional Analysis, Competitive Landscape, Growth Prospects & Forecast -2026