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Drug delivery via sublingual mucous membrane is considered to be a promising alternative to the oral route. This route is useful when rapid onset of action is desired as in the case of antiemetics such as ondansetron. In terms of permeability, the sublingual area of the oral cavity is more permeable than cheek and palatal areas of mouth. The drug absorbed via sublingual blood vessels bypasses the hepatic first-pass metabolic processes giving acceptable bioavailability with low doses and hence decreases the side effects. Sublingual drug delivery system is convenient for paediatric, geriatric, and psychiatric patients with dysphagia. This review highlights the different sublingual dosage forms, advantages, factors affecting sublingual absorption, pharmacology of ondasetron, methods of preparation and various in vitro and in vivo evaluation parameters of sublingual tablet of ondansetron
Sublingual route, ondansetron, dysphagia, improved bioavailability.