The invention provides a compressed pharmaceutical composition comprising polyethylene glycol of molecular weight from 2000 to 4500, wherein the polyethylene glycol makes up from 80 to 99.5% by weight of the composition, one or more electrolytes for the treatment of constipation, faecal impaction, faecal retention, intestinal gas and cramping, or flatulence; or for orthostatic lavage, colon evacuation or colon cleansing. It has been found, surprisingly, that a compressed pharmaceutical composition comprising PEG for example a solid tablet, is significantly more palatable than previously proposed compositions and is effective when administered. The compressed pharmaceutical composition of the invention comprising polyethylene glycol has been found to have a more agreeable taste and a more agreeable mouthfeel than previously proposed liquid or dry powder or granular compositions.