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Senna Strong Constipation Relief Tablets

Senna Strong Constipation Relief Tablets

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  • ✔️ Relieves occasional constipation with sennoside stimulant action
  • ✔️ Produces a bowel movement within 8 to 12 hours
  • ✔️ Suitable for adults and young people aged 12 and over
  • ✔️ Convenient once-daily tablet taken at bedtime
  • ✔️ Short-term constipation relief without a prescription needed

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Are Senna Tablets for Constipation Right for You?

 

Constipation is something most people experience at some point — and it can be genuinely uncomfortable. Whether it's infrequent bowel movements, straining, or that persistent feeling of not quite finishing, it disrupts daily life more than people often admit. Senna tablets for constipation are one of the most widely used over-the-counter options in the UK, and for good reason. Senna Strong Constipation Relief Tablets from My Store offer a straightforward, clinically recognised approach to relieving occasional constipation in adults and children aged 12 and over. You can browse the full range of constipation treatments in our constipation collection if you'd like to compare your options.

Each tablet contains sennosides — the active compounds derived from the senna plant — which have been used medicinally for centuries and remain a recommended option in current NHS guidance. At just £4.99, this product offers accessible relief without the need for a prescription.

 

How Do Senna Strong Tablets Work in the Body?

 

Senna works as a stimulant laxative. Once swallowed, the sennosides pass through the small intestine largely unchanged. When they reach the large intestine, gut bacteria convert them into active compounds that stimulate the smooth muscle lining of the bowel wall. This increases peristalsis — the wave-like contractions that move stool along — and also reduces water reabsorption from the colon, softening the stool in the process.

  • Sennosides are absorbed in the colon, not the stomach
  • Gut bacteria activate the compounds, triggering bowel muscle contractions
  • Water retention in the colon is increased, softening stools
  • A bowel movement typically occurs within 8 to 12 hours of taking the dose

This is why most people take senna at bedtime — so it works overnight and produces a result in the morning. It's a predictable, well-understood mechanism that makes senna a reliable choice for short-term constipation relief.

 

Who Is Senna Strong Constipation Relief Suitable For?

 

These tablets are intended for adults and young people aged 12 and over who are experiencing occasional constipation. They're particularly useful when dietary changes and increased fluid intake haven't been enough on their own. That said, senna isn't appropriate for everyone — it's important to check suitability before use.

  • Adults aged 18 and over experiencing occasional constipation
  • Young people aged 12–17 (under adult supervision and following pack dosage)
  • People who need a reliable overnight result
  • Those who have not responded adequately to dietary fibre or hydration changes alone

It is not suitable for children under 12, or for anyone with suspected bowel obstruction, severe abdominal pain of unknown cause, or inflammatory bowel conditions such as Crohn's disease or ulcerative colitis without first speaking to a doctor.

 

How Do Senna Tablets Compare to Other Laxative Types?

 

Feature Senna Strong Tablets Lactulose (Osmotic Laxative)
Mechanism Stimulates bowel muscle contractions Draws water into the bowel
Onset of action 8–12 hours 24–48 hours
Suitable for short-term use Yes Yes
Tablet form available Yes No (liquid only)

 

How Should You Store Senna Strong Tablets and Who Should Seek Advice First?

 

Store these tablets below 25°C in a dry place, away from direct sunlight and out of reach of children. Do not use after the expiry date printed on the packaging. If you're managing a digestive condition alongside constipation — such as IBS — it's worth exploring our IBS and cramps collection for additional support options.

If you are pregnant, breastfeeding, taking other medicines, or have a long-term health condition, speak to your pharmacist or GP before using senna tablets for constipation. This is especially important if you are taking diuretics, as the combination may increase the risk of electrolyte imbalance with prolonged use.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Senna Strong Constipation Relief Tablets specifications
Treatment category Constipation relief
Mechanism of action Stimulant laxative — stimulates colonic peristalsis via sennoside activation
Effective for Occasional constipation in adults and children aged 12+
Suitable for Adults and young people aged 12 and over
Active ingredient Sennosides (from senna leaf extract)
UK classification General Sale List (GSL) medicine
Drug class Stimulant laxative
Preparation Tablet
Route of administration Oral

Specifications of Senna Strong Constipation Relief Tablets

 

What Are Senna Strong Constipation Relief Tablets and What Are They Used For?

 

Senna Strong Constipation Relief Tablets are an over-the-counter stimulant laxative used to treat occasional constipation. The active ingredient, sennosides, is derived from the dried leaves of the senna plant (Cassia senna). These tablets are indicated for short-term relief of constipation in adults and young people aged 12 and over. The NHS describes constipation as passing fewer than three stools per week, or stools that are hard, dry, and difficult to pass — and senna is one of the recommended treatment options when lifestyle measures alone haven't helped.

 

What Do You Need to Know Before Using Senna Strong Tablets?

 

Before taking these tablets, it's important to check whether they are appropriate for you. Do not use them if any of the following apply:

  • You are under 12 years of age
  • You have or suspect a bowel obstruction (ileus)
  • You have severe abdominal pain, nausea, or vomiting of unknown cause
  • You have been diagnosed with inflammatory bowel disease (e.g. Crohn's disease or ulcerative colitis)
  • You are allergic to senna or any other ingredient in the tablet
  • You are pregnant or breastfeeding — seek medical advice first

The following medicines may interact with senna tablets. Always tell your pharmacist what you are currently taking:

  • Diuretics (water tablets) — increased risk of electrolyte imbalance with prolonged use
  • Digoxin and other cardiac glycosides — electrolyte disturbances may affect their action
  • Other laxatives — combining stimulant laxatives increases the risk of diarrhoea and dehydration
  • Some antibiotics — may reduce the bacterial conversion of sennosides in the gut, potentially affecting efficacy

 

How Should You Use Senna Strong Constipation Relief Tablets?

 

Always read the patient information leaflet supplied with the pack before use. Take the tablets orally with a full glass of water. Most people find taking them at bedtime most convenient, as the onset of action is typically 8 to 12 hours later.

  1. Read the full dosage instructions on the pack before starting
  2. Swallow the tablets whole with a large glass of water — do not crush or chew
  3. Take at bedtime for an expected morning bowel movement
  4. Do not take more than the recommended dose
  5. Do not use for more than 7 consecutive days without medical advice
Age Group Dose Frequency Maximum Duration
Adults (18+) 2 tablets Once daily at bedtime 7 days
Young people (12–17) 1–2 tablets (as directed on pack) Once daily at bedtime 7 days
Children under 12 Not suitable

 

What Are the Possible Side Effects of Senna Strong Tablets?

 

Like all medicines, senna tablets can cause side effects, although not everyone experiences them. If you're also dealing with digestive discomfort beyond constipation, our indigestion collection may offer additional support.

Common side effects:

  • Abdominal cramps or stomach pain
  • Loose stools or diarrhoea
  • Flatulence (wind)
  • Nausea

Less common side effects:

  • Electrolyte imbalance (particularly with prolonged use) — symptoms may include muscle weakness or irregular heartbeat
  • Discolouration of urine (harmless, may appear yellow-brown or reddish)
  • Skin rash or allergic reaction (rare — stop use immediately and seek medical advice)
  • Melanosis coli — a harmless darkening of the bowel lining seen with long-term use

Stop taking the tablets and contact your GP or pharmacist if you experience severe abdominal pain, blood in your stools, or signs of an allergic reaction such as swelling of the face or difficulty breathing.

 

How Should You Store Senna Strong Constipation Relief Tablets?

 

Correct storage helps maintain the quality and safety of the tablets throughout their shelf life. If you're looking for other health essentials to keep at home, our pain relief collection is worth a look too.

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the packaging
  • Do not store in a bathroom cabinet — humidity can degrade the tablets
  • Dispose of unused or expired tablets safely via your local pharmacy

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Senna Strong Constipation Relief Tablets online in the UK?

You can buy Senna Strong Constipation Relief Tablets directly from Cured Pharmacy, a GPhC-registered online pharmacy, for just £4.99. No prescription is required as this is an over-the-counter medicine. Browse our full constipation collection for the complete range of relief options available.

How do senna tablets work in the body?

Senna tablets contain sennosides, which travel to the large intestine where gut bacteria convert them into active compounds. These compounds stimulate the smooth muscle of the bowel wall, increasing contractions and speeding up the passage of stools. They also reduce water reabsorption in the colon, which helps soften the stool and makes it easier to pass.

How do I take Senna Strong Constipation Relief Tablets step by step?

Swallow the tablets whole with a full glass of water — do not crush or chew them. Take them at bedtime so they can work overnight, with a bowel movement expected within 8 to 12 hours. Always follow the dosage instructions on the pack and do not exceed the stated dose.

What is the correct dose of senna tablets for adults?

The standard adult dose is typically 2 tablets taken once daily at bedtime. Young people aged 12 to 17 should follow the dosage stated on the pack, which may be 1 to 2 tablets. Children under 12 should not take these tablets.

When is the best time to take senna tablets?

Bedtime is generally the best time to take senna tablets, as the 8 to 12 hour onset means you can expect a bowel movement the following morning. Taking them with food is not required, but drinking a full glass of water with each dose is recommended. Consistency in timing helps you predict when the laxative effect will occur.

What are the side effects of senna tablets and how do I manage them?

Common side effects include abdominal cramps, loose stools, wind, and nausea — these are usually mild and short-lived. If you experience severe cramping or diarrhoea, reduce the dose or stop use and speak to your pharmacist. Staying well hydrated while taking senna can help minimise discomfort.

Who should not take senna tablets?

Senna tablets are not suitable for children under 12, people with bowel obstruction, or those with severe unexplained abdominal pain. They should also be avoided by people with inflammatory bowel disease such as Crohn's disease or ulcerative colitis without medical advice. Pregnant or breastfeeding women should consult a GP or pharmacist before use.

How long can you take senna tablets for?

Senna tablets should not be used for more than 7 consecutive days without seeking medical advice. Prolonged use of stimulant laxatives can lead to dependence, where the bowel becomes reliant on the medication to function. If constipation persists beyond a week, speak to your GP to rule out an underlying cause.

What happens if I miss a dose of senna tablets?

If you forget to take a dose, simply take it the next evening at your usual bedtime — do not double up to make up for a missed dose. Senna is taken on an as-needed basis for occasional constipation, so missing one dose is unlikely to cause any harm. If you are unsure, speak to your pharmacist for guidance.

Can I take senna tablets if I am pregnant?

Senna is generally not recommended during pregnancy without medical advice, particularly in the first trimester. The NHS advises that pregnant women experiencing constipation should first try increasing dietary fibre and fluid intake. If laxatives are needed, speak to your midwife or GP before using senna tablets.

Can senna tablets be taken alongside other medicines?

Senna may interact with diuretics, digoxin, and other laxatives — particularly if used long-term — due to the risk of electrolyte imbalance. Always tell your pharmacist about any other medicines you are taking before starting senna. If you are on regular medication, it is safest to take senna at a different time of day to avoid affecting absorption.

Are senna tablets suitable for people with IBS?

Senna tablets are generally not recommended as a first-line treatment for IBS-related constipation, as stimulant laxatives can sometimes worsen cramping and bloating in people with IBS. You may find our IBS and cramps collection more helpful for managing IBS symptoms. Always speak to your GP or pharmacist before using senna if you have a diagnosed bowel condition.

What are the alternatives to senna tablets for constipation?

Alternatives include bulk-forming laxatives (such as ispaghula husk), osmotic laxatives (such as lactulose or macrogol), and stool softeners (such as docusate sodium). The NHS recommends trying dietary changes — more fibre, more fluids, and regular exercise — before reaching for any laxative. If you need to compare options, our constipation collection lists a range of available treatments.

Will senna tablets cause my bowel to become lazy or dependent?

There is some evidence that long-term use of stimulant laxatives, including senna, can reduce the bowel's natural ability to function independently — sometimes called laxative dependence. This is why senna is recommended only for short-term use of up to 7 days. If you find you need laxatives regularly, speak to your GP about longer-term management strategies.

What does the latest research say about senna for constipation?

Senna has been used as a laxative for centuries and remains a well-established, evidence-based treatment for short-term constipation, as recognised by the NHS and the British National Formulary. Current clinical guidance supports its use for occasional constipation in adults and children over 12, with a well-understood safety profile when used as directed. Research continues to support dietary fibre and hydration as the preferred first-line approach, with senna as a reliable short-term option when these measures are insufficient.

How Should You Use Senna Strong Constipation Relief Tablets?

These tablets are taken orally with a full glass of water. It's important to swallow them whole — do not crush, break, or chew them, as this can affect how the active ingredient is released. Most people find taking them at bedtime the most practical approach, given the 8 to 12 hour onset of action.

Follow these steps each time you take a dose:

What Is the Correct Dose of Senna Strong Constipation Relief Tablets?

The dose varies depending on your age. Always follow the instructions on the pack, and do not exceed the stated maximum dose. If you are unsure whether the dose is appropriate for you, speak to your pharmacist before use.

When Is the Best Time to Use Senna Strong Constipation Relief Tablets?

Bedtime is the most effective time to take senna tablets. Because the onset of action is typically 8 to 12 hours, taking them in the evening means you can expect a bowel movement the following morning — which fits naturally into most people's routines. Taking them at a consistent time each day also helps you anticipate when the effect will occur, reducing any inconvenience.

You do not need to take senna with food, but drinking plenty of water throughout the day — not just at the time of dosing — supports healthy bowel function and can help reduce the risk of cramping.

How Long Can You Use Senna Strong Constipation Relief Tablets For?

Senna tablets are intended for short-term use only. Do not use them for more than 7 consecutive days without first speaking to your GP or pharmacist. If constipation persists beyond this period, it may indicate an underlying cause that needs investigation — such as a dietary issue, medication side effect, or a bowel condition.

Long-term or excessive use of stimulant laxatives can lead to electrolyte imbalances and may reduce the bowel's natural ability to function without assistance. If you find yourself needing laxatives regularly, your GP can help identify the root cause and recommend a more sustainable management plan.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Senna Strong Constipation Relief Tablets?

Most people tolerate senna tablets well when taken at the recommended dose for a short period. However, as with any stimulant laxative, some side effects can occur. The most common ones are related to the way senna works — by stimulating bowel contractions — and are usually mild and temporary.

  • Abdominal cramps or stomach pain
  • Loose stools or diarrhoea
  • Flatulence (wind) and bloating
  • Nausea
  • Harmless yellow-brown or reddish discolouration of urine

What Are the Less Common Side Effects of Senna Strong Tablets?

Less commonly, some people may experience side effects that are more significant, particularly if senna is used for longer than recommended or at higher than stated doses. These are not typical with short-term use at the correct dose, but it's worth being aware of them.

  • Electrolyte imbalance — symptoms may include muscle weakness, fatigue, or irregular heartbeat
  • Melanosis coli — a harmless darkening of the bowel lining associated with prolonged stimulant laxative use
  • Dehydration — particularly if diarrhoea is severe or prolonged
  • Skin rash or itching (rare)

What Are the Serious Side Effects of Senna Strong Tablets?

Serious side effects are rare when senna is used correctly and for short periods. However, you should stop taking the tablets immediately and seek urgent medical attention if you notice any of the following:

  • Signs of a severe allergic reaction — swelling of the face, lips, tongue, or throat; difficulty breathing; or a widespread skin rash
  • Blood in your stools or rectal bleeding
  • Severe or worsening abdominal pain
  • Symptoms of significant electrolyte disturbance — such as muscle cramps, confusion, or heart palpitations

What Should You Do If You Experience Side Effects of Senna Tablets?

If you experience mild side effects such as cramping or loose stools, try reducing your dose and ensuring you are drinking enough water throughout the day. Mild symptoms often resolve on their own once the laxative effect has passed. Do not take additional doses to compensate for diarrhoea — this can worsen dehydration.

If side effects are persistent, worsening, or causing significant distress, stop taking the tablets and speak to your pharmacist or GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Senna Strong Tablets Interact With Other Medicines?

Yes, senna can interact with certain medicines. The most clinically significant interactions involve diuretics (water tablets) and cardiac glycosides such as digoxin — prolonged use of senna alongside these medicines can increase the risk of electrolyte imbalances, which may affect how these drugs work. Taking senna at the same time as other oral medicines may also temporarily affect their absorption, so it is generally advisable to take senna separately from other medications where possible. Always inform your pharmacist of all medicines you are currently taking before starting senna tablets.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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