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Rxfarma Natural Senna Laxatives Tablets - 20 (BRAND MAY VARY)

Rxfarma Natural Senna Laxatives Tablets - 20 (BRAND MAY VARY)

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  • ✔️ Relieves occasional constipation within 8 to 12 hours
  • ✔️ Plant-derived senna works naturally with your bowel
  • ✔️ Convenient once-daily bedtime dosing for morning relief
  • ✔️ Suitable for adults and young people aged 12 and over
  • ✔️ Pack of 20 tablets for short-term constipation management

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Are Senna Laxative Tablets Right for You?

 

Constipation is something most people experience at some point — and it can be genuinely uncomfortable. Whether it's a change in diet, reduced activity, or simply not drinking enough water, an irregular bowel can leave you feeling sluggish and bloated. Senna laxative tablets offer a plant-based, time-tested option for getting things moving again. Rxfarma Natural Senna Laxative Tablets come in a convenient pack of 20 and are available from Cured Pharmacy for just £1.99, making them one of the most accessible over-the-counter constipation remedies available in the UK. If you're looking for broader digestive support, you might also find our IBS and Cramps collection helpful.

Senna has been used medicinally for centuries. It's derived from the dried leaves and pods of the Cassia senna plant and is classified by the NHS as a stimulant laxative. It's widely recommended for short-term relief of occasional constipation in adults and children aged 12 and over.

 

How Do Senna Tablets Work to Relieve Constipation?

 

Senna works through a well-understood mechanism. The active compounds — called sennosides — are not absorbed in the small intestine. Instead, they travel to the large bowel, where gut bacteria convert them into active metabolites. These metabolites then act directly on the bowel wall.

  • Sennosides stimulate the nerve plexus in the colon wall, triggering peristaltic muscle contractions.
  • This speeds up the movement of stool through the large intestine.
  • Senna also reduces water and electrolyte absorption from the colon, softening the stool.
  • A bowel movement typically occurs within 8 to 12 hours of taking the tablet.

Because of this overnight action, most people find it convenient to take senna at bedtime, waking to a natural bowel movement in the morning.

 

Who Is Suitable for Using Senna Laxative Tablets?

 

These tablets are suitable for adults and young people aged 12 and over who are experiencing occasional constipation. They're particularly useful when dietary changes alone — such as increasing fibre and fluid intake — haven't been enough to restore regularity.

  • Adults experiencing occasional or short-term constipation
  • People who prefer a plant-derived laxative option
  • Those who need a reliable overnight result
  • Individuals who find bulk-forming laxatives insufficient

They are not suitable for children under 12, or for anyone with suspected bowel obstruction, severe abdominal pain, 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 Laxative Tablets Bulk-Forming Laxative (e.g. Fybogel)
Type Stimulant laxative Bulk-forming laxative
Onset of action 8–12 hours 12–72 hours
Plant-derived Yes (senna plant) Yes (ispaghula husk)
Suitable for short-term use Yes (up to 7 days) Yes (longer term possible)

 

How Should You Store Senna Laxative Tablets?

 

Store your senna laxative tablets below 25°C in a cool, dry place away from direct sunlight and moisture. Keep the pack tightly closed and out of the reach and sight of children. Do not use after the expiry date printed on the packaging. If you're managing multiple health products at home, it's worth checking our constipation collection for complementary options.

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.

Rxfarma Natural Senna Laxative Tablets 20 specifications
Treatment category Constipation relief
Mechanism of action Stimulant laxative — stimulates colonic peristalsis via sennosides
Effective for Short-term relief of occasional constipation
Suitable for Adults and children aged 12 and over
Active ingredient Sennoside B (as senna leaf extract)
Pack size 20 tablets
UK classification General Sale List (GSL)
Drug class Stimulant laxative
Preparation Tablet
Route of administration Oral

Specifications of Rxfarma Natural Senna Laxative Tablets 20

 

What Are Rxfarma Senna Tablets and What Are They Used For?

 

Rxfarma Natural Senna Laxative Tablets contain senna, a plant-derived stimulant laxative used to treat occasional constipation. Constipation is defined by the NHS as passing fewer than three stools per week, or passing stools that are hard, dry, and difficult to pass. These tablets are intended for short-term use only — typically no longer than seven consecutive days — and are available without a prescription for adults and young people aged 12 and over.

Senna is one of the most commonly used laxatives in the UK and is included on the NHS list of medicines used to treat constipation. It is not a treatment for the underlying cause of constipation, so if your symptoms persist beyond a week, you should speak to your GP.

 

What Do You Need to Know Before Using Senna Tablets?

 

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

  • You are under 12 years of age
  • You have a bowel obstruction or suspected bowel obstruction
  • You have severe abdominal pain, nausea, or vomiting of unknown cause
  • You have inflammatory bowel disease (e.g. Crohn's disease or ulcerative colitis)
  • You are pregnant or breastfeeding (seek medical advice first)
  • You have a known allergy to senna or any ingredient in the tablet
  • You have appendicitis or undiagnosed rectal bleeding

Senna may interact with certain medicines. Known interactions include:

  • Diuretics — increased risk of electrolyte imbalance, particularly low potassium
  • Digoxin — hypokalaemia caused by senna may increase digoxin toxicity
  • Antiarrhythmic medicines — electrolyte disturbances may affect heart rhythm
  • Corticosteroids — combined use may worsen potassium loss

Always tell your pharmacist about all medicines you are currently taking, including herbal remedies and supplements. You can also browse our Vitamins and Supplements collection if you're looking to support your digestive health alongside laxative use.

 

How Should You Use Rxfarma Senna Tablets?

 

Always use this medicine exactly as directed on the label or as advised by your pharmacist. The following steps will help you use senna safely and effectively:

  1. Read the patient information leaflet inside the pack before use.
  2. Take the tablets at bedtime with a full glass of water.
  3. Swallow the tablets whole — do not crush or chew them.
  4. Expect a bowel movement within 8 to 12 hours.
  5. Do not take more than the recommended dose.
  6. Do not use for more than 7 consecutive days without medical advice.
Indication Age Group Dose Frequency
Occasional constipation Adults and children 12+ 2 tablets Once daily at bedtime
Occasional constipation Under 12 Not recommended

 

What Are the Possible Side Effects of Senna Tablets?

 

Like all medicines, senna can cause side effects, although not everyone experiences them. Most side effects are mild and related to the laxative action of the medicine.

Common side effects:

  • Abdominal cramps or discomfort
  • Loose stools or diarrhoea
  • Bloating or flatulence
  • Harmless discolouration of urine (yellow-brown or pink)

Less common side effects:

  • Nausea
  • Electrolyte imbalance with prolonged use (e.g. low potassium)
  • Skin rash or allergic reaction (rare — stop use immediately)
  • Melanosis coli — a harmless darkening of the bowel lining with long-term use

If you experience severe abdominal pain, rectal bleeding, or signs of an allergic reaction such as swelling of the face or difficulty breathing, stop taking the tablets and seek urgent medical attention. For related digestive concerns, our Haemorrhoids and Piles collection may also be of interest if straining has been an issue.

 

How Should You Store Rxfarma Senna Tablets?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and moisture
  • Keep the pack tightly closed when not in use
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the packaging
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your 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 laxative tablets online in the UK?

You can buy Rxfarma Natural Senna Laxative Tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £1.99 per pack of 20. No prescription is required as senna is available over the counter as a General Sale List medicine. Simply add to your basket and choose your preferred delivery option at checkout.

How do senna laxative tablets work in the body?

Senna contains active compounds called sennosides, which pass through the small intestine unabsorbed and reach the large bowel, where gut bacteria convert them into active metabolites. These metabolites stimulate the nerve plexus in the colon wall, triggering muscle contractions that move stool along. The result is typically a bowel movement within 8 to 12 hours of taking the tablet.

How do I take senna laxative tablets step by step?

Take 2 tablets at bedtime with a full glass of water, swallowing them whole without crushing or chewing. The tablets will work overnight, and you should expect a bowel movement the following morning. Do not take more than the recommended dose and do not use for more than 7 consecutive days without speaking to a pharmacist.

What is the correct dose of senna tablets for adults?

The standard recommended dose for adults and young people aged 12 and over is 2 tablets taken once daily at bedtime. You should not exceed this dose unless specifically advised to do so by a healthcare professional. Senna is not recommended for children under 12 years of age.

What is the best time to take senna laxative tablets?

Bedtime is the most practical time to take senna tablets, as the 8 to 12 hour onset means you'll typically have a bowel movement the following morning. Taking them at a consistent time each day also helps your body establish a more regular routine. Avoid taking them just before physical activity or travel where toilet access may be limited.

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

The most common side effects are abdominal cramps, bloating, and loose stools, which are usually mild and short-lived. Drinking plenty of water and not exceeding the recommended dose can help minimise discomfort. If you experience severe pain, rectal bleeding, or signs of an allergic reaction, stop use immediately and contact your GP or pharmacist.

Who should not take senna laxative tablets?

Senna is not suitable for children under 12, people with bowel obstruction, inflammatory bowel disease, or unexplained severe abdominal pain. Pregnant or breastfeeding women should seek medical advice before use. Anyone taking digoxin, diuretics, or antiarrhythmic medicines should also speak to their pharmacist first due to the risk of electrolyte interactions.

Are senna laxative tablets safe to take during pregnancy?

Senna is generally not recommended during pregnancy, especially in the first trimester, without first consulting a GP or midwife. The NHS advises that stimulant laxatives should be used with caution in pregnancy. If you are pregnant and struggling with constipation, speak to your healthcare provider about safer alternatives such as bulk-forming laxatives.

How long can you take senna laxative tablets for?

Senna should only be used for short-term relief of occasional constipation — typically no longer than 7 consecutive days. Prolonged use without medical supervision can lead to laxative dependence, electrolyte imbalances, and a condition called melanosis coli, which is a harmless darkening of the bowel lining. If constipation persists beyond a week, speak to your GP.

What happens if I miss a dose of senna tablets?

If you forget to take your dose at bedtime, simply take it the following night — 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 problems. Continue with the normal recommended dose the next evening.

What are the alternatives to senna laxative tablets?

Alternatives include bulk-forming laxatives such as ispaghula husk (e.g. Fybogel), osmotic laxatives such as lactulose or macrogol, and stool softeners such as docusate sodium. The right choice depends on the cause and severity of your constipation. You can explore our full constipation range to compare available options.

Can senna tablets interact with other medicines I'm taking?

Yes — senna can interact with diuretics, digoxin, antiarrhythmic medicines, and corticosteroids, primarily by causing or worsening low potassium levels (hypokalaemia). This can be clinically significant, particularly for people with heart conditions. Always inform your pharmacist of all medicines you are taking before starting senna.

Are senna laxative tablets suitable for vegetarians or vegans?

Senna itself is a plant-derived ingredient, but whether the tablets are suitable for vegans depends on the excipients (inactive ingredients) used in the specific formulation. Check the product packaging or patient information leaflet for full ingredient details. If you're looking for verified vegan health products, our Vegan collection may be a useful starting point.

Will senna laxative tablets cause dependency?

Using senna for longer than 7 days without medical advice can lead to the bowel becoming reliant on stimulant laxatives to function, a condition sometimes called laxative dependency. This is why senna is recommended only for short-term, occasional use. If you find you need a laxative regularly, speak to your GP to investigate the underlying cause of your constipation.

What is the latest research on senna as a laxative?

Senna has been used medicinally for centuries and remains one of the most studied stimulant laxatives. Current clinical evidence, as reflected in NHS and BNF guidance, supports its short-term use for constipation in adults and children over 12. Research continues to confirm its efficacy and safety profile when used as directed, with no significant new safety concerns identified in recent years.

How Should You Use Rxfarma Senna Laxative Tablets?

Using senna tablets correctly gives you the best chance of effective, comfortable relief. Always read the patient information leaflet included in the pack before you start, and follow the steps below carefully.

What Is the Correct Dose of Rxfarma Senna Laxative Tablets?

The dose below applies to occasional constipation only. Do not adjust the dose without first speaking to a healthcare professional, and never exceed the stated amount.

When Is the Best Time to Use Rxfarma Senna Laxative Tablets?

Bedtime is the ideal time to take senna tablets. Because the onset of action is 8 to 12 hours, taking them in the evening means the laxative effect occurs in the morning — a far more convenient time for most people. Try to take them at roughly the same time each evening to help establish a consistent routine, and make sure you have easy access to a toilet the following morning.

How Long Can You Use Rxfarma Senna Laxative Tablets For?

Senna tablets are intended for short-term use only. The NHS recommends using stimulant laxatives for no longer than 7 consecutive days without medical supervision. Using them for longer than this can cause the bowel to become dependent on stimulation to function, and may lead to electrolyte imbalances — particularly low potassium. If your constipation has not resolved within a week, or if it keeps returning, make an appointment with your GP to explore the underlying cause.

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 Laxative Tablets?

Most people who take senna tolerate it well, but some do experience side effects — particularly those related to the stimulant action on the bowel. These are usually mild and resolve once the bowel has moved.

  • Abdominal cramps or griping pains
  • Loose stools or diarrhoea
  • Bloating and flatulence
  • Discolouration of urine to a yellow-brown or pinkish colour (harmless)

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

Less frequently, some people may notice the following effects, particularly with prolonged or excessive use. These are more likely if senna is taken beyond the recommended 7-day period.

  • Nausea or feeling sick
  • Low potassium levels (hypokalaemia) — may cause muscle weakness or fatigue
  • Melanosis coli — a reversible darkening of the bowel lining seen with long-term use
  • Skin rash or itching (uncommon)

What Are the Serious Side Effects of Senna Laxative Tablets?

Serious side effects are rare when senna is used as directed, but you should be aware of the warning signs. Stop taking the tablets immediately and seek urgent medical attention if you experience any of the following:

  • Severe or worsening abdominal pain
  • Rectal bleeding or blood in your stool
  • Signs of an allergic reaction — swelling of the face, lips, or throat, difficulty breathing, or a widespread rash
  • Severe muscle weakness or irregular heartbeat (possible signs of low potassium)

What Should You Do If You Experience Side Effects?

For mild side effects such as cramps or loose stools, reducing your fluid intake of caffeine and alcohol, staying well hydrated with water, and not exceeding the recommended dose can all help. If side effects are persistent or troubling, stop use and speak to your pharmacist. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Senna Laxative Tablets Interact With Other Medicines?

Yes. Senna can interact with several medicines, primarily by causing or worsening low potassium levels. This is particularly relevant for people taking diuretics (water tablets), digoxin (for heart conditions), antiarrhythmic medicines, or corticosteroids. If you are taking any of these, speak to your pharmacist before using senna. Combining senna with other laxatives is also not recommended without medical advice.

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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