It is not advisable to use them during pregnancy. Locally acting glycerol - glycerin suppositories are an allowed over-the-counter supplement. After being inserted into the anus, the suppositories melt under the influence of heat and form an oil film on the walls of the intestine, which increases the glide of the stool and facilitates emptying. For constipation, Duphalac syrup containing the carbohydrate lactulose is also often used, which softens the stool and contributes to faster bowel emptying. It is better to consult your doctor about the use of any chosen over-the-counter product.