Frangula is a fibre that is commonly used as a laxative in powder or granule form to ease constipation. It is safe in pregnancy, but not advised for use in breastfeeding and children under 12 years, and should not be used for a long period of time.
Do not take frangula supplements if on a salt, potassium or sugar restricted diet; suffering from severe constipation with impacted faeces; suffering from belly pain, nausea or vomiting, or suffering from ulcerative colitis or acute diverticulitis. It interacts with thiazide diuretics, steroids, liquorice and high sugar content sweets. Patients should ensure that they consume adequate amounts of water when this supplement.