Glycerol oral liquids

Glycerol is a colorless sjrupy liquid that is used medically as a laxative given orally, as an enema, or in the form of snppositories. Oral hjtpertonic glycerol has been used as a test for reversibility of the sjmptoms of Meniere s disease (1) however, it canses headache, nausea, and vomiting and is of poor sensitivity and specificity. 

When saliva production is insufficient, many different liquids can be used. They vary from glycerol with citric acid to the saliva substitutes already mentioned in Sect. 7.1. Citric acid stimulates the saliva production in the salivary glands, and therefore raises the amount of saliva in the mouth. If there is damage to the oral mucosa, it is best to avoid ethanol and propylene glycol, because these solvents may cause irritation, A German hospital developed an... 

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