Nausea Medicine Market, By Drug Class (Antihistamines, Anticholinergics, Serotonin Antagonists, Dopamine Antagonists, Cannabinoids, and Others), By Route of Administration (Oral, Injectable, Transdermal, Rectal, and Others), By Distribution Channel (Retail Pharmacies, Hospital Pharmacies, Online Pharmacies, and Others), By Geography (North America, Latin America, Europe, Asia Pacific, Middle East & Africa)