Senna

What is Senna?

Senna is a laxative derived from the senna fruit, and it’s used to treat constipation. The senna leaf and fruit (also called pods) contain many organic chemicals like sennosides, which have laxative properties.^[3] It has been used as a natural laxative and as a traditional medicine for many years.

Constipation can be caused by a few things, such as a lack of fibre in your diet, excessive use of laxatives, or overconsumption of caffeine. ^[1] These factors can lead to symptoms like infrequent bowel movements and stomach cramps.

How does Senna work?

Senna is a stimulant laxative, meaning it stimulates contractions in your intestine. This speeds up the movement of stool through your lower colon. It also inhibits water absorption in your intestine, which increases stool volume.^[2] Both of these mechanisms help to relieve your constipation.

What doses of Senna are there?

Your Senna dosage will depend on your health needs and symptoms. Typically, for adults two tablets are taken every day. And children over 12 years old are generally advised to take one tablet a day.

How to take Senna

To take Senna, take one or two tablets once a day, near your bedtime. Whilst taking Senna, make sure to drink plenty of water (6-8 glasses) throughout the day for it to work effectively. You’ll usually only take Senna for a few days. If it’s been more than 3 days and you still have constipation, contact your clinician online. Don’t take Senna for more than 7 days.

How long does Senna take to work?

It takes eight hours for Senna to have full effect, which is why it’s recommended to take it before bedtime. This way, by the time it’s morning you’ll be able to relieve yourself.

What happens if I make a mistake when taking Senna?

If you take too much Senna, you can develop ‘lazy bowel’, a condition when the muscle becomes too relaxed and you can’t empty your bowels frequently enough. This can then lead to long-term (chronic) constipation. To avoid this, always make sure to follow the directions given to you by your clinician and read the patient information leaflet.