glycerol at a glance
Medicine class
Demulcent in cough syrups; locally acting laxative in suppositories
Main uses
Relief of dry, tickly coughs or sore throats, and occasional constipation
Available forms
Oral syrups and rectal suppositories; they are not interchangeable
Suppository use
Rectal use only; moisten the tip with water before insertion
What is glycerol used for?
Glycerol products are licensed for symptom relief in two distinct settings.
Oral syrups: soothing relief of dry, tickly coughs; one selected product also includes sore-throat symptoms.
Suppositories: occasional constipation, with infant-size and adult-size products available.
How does glycerol work?
In cough syrup, glycerol coats irritated throat surfaces and may reduce stimulation of sensory cough receptors. Rectally, it draws in water, lubricates and softens hardened stool, and mildly irritates the rectum to encourage evacuation.
glycerol preparations and strengths
Oral solution
Route: Oral
Strengths: 1.36 g/5 mL
Suppository
Route: Rectal
Strengths: 1 g, 2 g, 4 g
How to take glycerol
Follow the leaflet for the exact product because oral syrups and suppository sizes have different instructions.
Shake oral solutions when directed and use the supplied measuring device.
Suppositories are for rectal use only and must not be swallowed.
Unwrap the suppository, moisten its tip with water and gently insert it into the rectum. Wash your hands before and afterwards.
Use a suppository when you can remain near a toilet.
glycerol side effects
Common or expected effects
- Rectal irritation or burning after a suppository
- Abdominal cramps after a suppository
- Loose stools or diarrhoea, particularly with excessive use
- Maltitol-containing cough syrups may have a mild laxative effect
glycerol in pregnancy
Advice varies by product. Selected oral syrups advise use only when recommended by a doctor because pregnancy data are limited. One selected suppository advises avoiding use during the first trimester, while SPS states that a suppository may be considered when other constipation measures have not worked. Ask a pharmacist, midwife or prescriber before use.
glycerol interactions
No medicine interactions are known for several selected products, although formal interaction studies have not been performed for one selected suppository.
Other medicines
No established interaction is listed. Check with a pharmacist if using other rectal products or concerned about a specific combination.
Common questions about glycerol
Answers are fully visible for fast scanning and source review.
Is glycerol the same as glycerin?
Yes. Glycerin is an alternative name commonly used on product labels for glycerol.
Is glycerol cough syrup a cough suppressant?
It is primarily a soothing demulcent rather than a centrally acting suppressant. Its coating action may reduce stimulation of sensory cough receptors.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.