Movicol Sachets Plain 30s Movicol Plain Powder Sachets for oral solution is a laxative for the treatment of constipation in adults, adolescents & elderly. It is not recommended for children below 12 years of age. It helps you to have a comfortable bowel movement even if you have been constipated for a long time. Movicol also works in very bad constipation called faecal impaction.