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  3. Choose delivery method and mode of payment.
  4. Our team of expert prescribers will assess whether medication is suitable.
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You can pay for your order using credit, debit card and bank transfer.

Card Payment: Please notify us that you wish to cancel your order. Your refund will show available In 1 - 3 days.

Bank Transfer: A member of our team will contact you requesting for your bank details. These details are only used to transfer the funds back into your account.

Treatment Information

Table of contents

Buy Fybogel Sachets Online UK

Fybogel is a natural, bulk-forming laxative which regulates the movements of the bowel and eases the passing of stool.

It contains an insoluble fibre derived from the seeds of a plant called Plantago ovata.

Fybogel (original) and Fybogel Hi-Fibre sachets are available to buy in two flavours - orange and lemon - and contain 3.5mg of ispaghula husk.

If you don't have the time to visit a pharmacy in person, you can order Fybogel from Prescription Doctor’s online UK pharmacy, and have it shipped directly to your door in discreet packaging. We offer a next-day delivery, as well as a special Saturday delivery - simply choose the option you prefer at checkout.

To begin your order with Prescription Doctor, press the green button above and fill out our short online medical form.

If you have any questions about Fybogel or your condition, you can chat with one of our online doctors using the messages feature under your Prescription Doctor account.

What is Fybogel used for?

Fybogel can be used to increase the amount of fibre in your diet to prevent constipation, and can help to relieve constipation by bulking up the stools in the intestines.

While constipation is rarely a serious condition, it can be distressing and painful in some cases, and is a common cause of haemorrhoids.

In people with haemorrhoids (piles), Fybogel can make it easier to pass stools and relieve the pressure put on the piles.

In addition to relieving the pain of going to the toilet while you have piles, Fybogel can help to prevent further haemorrhoids from developing due to constipation.

What causes constipation?

Constipation can happen to anyone at any age, though some people may be more prone to experiencing constipation than others.

Common causes of constipation include not eating enough fibrous foods like fruits, vegetables and cereals, not drinking enough water, or living a sedentary lifestyle.

Putting off the urge to go to the toilet can cause your body to draw water from your bowels, resulting in constipation.

Some medicines, particularly pain relief medicines like opioids and NSAIDs, and diuretics (water tablets) used to treat conditions such as high blood pressure, can cause constipation.

If you suspect a medicine you have been prescribed is causing your constipation, speak to your doctor. Do not stop or adjust the dosage of any medication you take without first speaking to your doctor.

Constipation is common among pregnant women, due to hormonal changes. If you are concerned about constipation during pregnancy, speak to your doctor for advice.

How can I treat constipation naturally?

You can treat constipation naturally by drinking more fluids throughout the day, eating more fibre and exercising regularly.

Cutting down on caffeine and alcohol can also help, as these have a mild diuretic effect, meaning they cause your body to expel more water than usual.

Generally, eating a healthy diet full of fruit and vegetables, staying hydrated and exercising regularly, are usually enough to prevent constipation. Eat at regular times and have a routine of your bathroom habits.

Some foods, such as figs, prunes and dates, can have a laxative effect and may be helpful in relieving constipation.

Going for a walk or a run can help to move your bowels along - but remember to keep hydrated by drinking plenty of water while exercising.

Reducing stress and anxiety can also help you regulate your bowels. For some people, stress and anxiety can contribute to constipation.

How does Fybogel work?

The active ingredient of Fybogel is ispaghula husk.

Ispaghula husk is a plant-derived, bulk-forming laxative. It treats constipation by increasing the volume of faeces within the intestines. This fibre becomes more viscous when it comes into contact with water in your gut, increasing the faecal matter. When the faeces become large enough, they press against the walls of the bowel, stimulating the muscles which surround the bowel to move the faecal matter along.

Fybogel Mebeverine - another formulation of Fybogel - contains a muscle relaxant called mebeverine in addition to ispaghula husk. The combined actions of these two ingredients help to make the passing of stools easier when you are constipated.

How long does Fybogel take to work?

Fybogel usually takes 2 to 3 days to start working to relieve constipation.

If you not notice an improvement in your condition after taking Fybogel for 1 week, speak to your doctor.

How do I take Fybogel?

Always read the patient information leaflet before taking Fybogel.

Fybogel should be taken after a meal, and at least 1/2 an hour to 1 hour before or after taking other medicines.

The recommended dose for adults is 1 sachet in the morning and 1 sachet in the evening.

When opening Fybogel sachets, take care not to inhale the powder. Inhalation of the powder can cause allergic reactions.

1. Empty the contents of a sachet into a glass and add at least 150ml (1/4 pint) of cold water. If you do not mix the Fybogel with enough water, chest pain, vomiting or difficulty swallowing may occur.

2. Stir the mixture until all the granules have completely dissolved.

3. Once thoroughly mixed, drink the solution straight away.

Do not take Fybogel within an hour before going to bed.

What should I do if I forget to take Fybogel when I should?

If you forget to take Fybogel when you should, skip the missed dose and take your next dose at the usual time.

Do not take more Fybogel to make up for the dose you missed.

What should I do if I accidentally take too much Fybogel?

If you accidentally take more Fybogel than you should, make sure to drink plenty of fluids. If you are unsure how much of the medicine you are supposed to take, speak to your doctor or a pharmacist.

Taking more Fybogel will not treat your constipation any faster, but can increase your risk of side effects.

Fybogel side effects and cautions

Before you take Fybogel, read the patient information leaflet supplied with your medicine. The leaflet details instructions on how to use and store Fybogel, as well as important safety information including side effects and who shouldn't take Fybogel.

If you have any concerns about anything you read in the patient information leaflet, seek advice from your doctor or a pharmacist.

You can view the patient information leaflet for Fybogel Plain online (PDF).

Who should not take Fybogel?

Fybogel is not suitable for everyone. If you are unsure whether Fybogel is safe for you, talk to your doctor. They will be able to determine the safety of Fybogel for you.

Do not take Fybogel if you:

  • are breastfeeding
  • have a blockage of the bowel
  • have difficulty swallowing or have a problem with your throat
  • have had a sudden change in bowel habit that has lasted longer than 2 weeks
  • have muscle weakness or decreased activity of the bowel (mega colon or paralysis of the intestine)
  • have severe constipation or have passed blood from the bowel

Speak to your doctor before taking Fybogel if you:

  • are over 40 years of age
  • are pregnant or planning on becoming pregnant
  • have been prescribed a potassium-sparing diuretic or potassium supplement
  • have blood in your stools
  • have unusual vaginal bleeding or discharge

Leave at least 1/2 to 1 hour between taking Fybogel and the following medicines:

  • Insulin (for diabetes)
  • Medicines for thyroid problems

If you are unsure whether Fybogel is safe for you, speak to your doctor or a pharmacist.

Side effects of Fybogel

All medicines carry the risk of side effects, though not everybody gets them. Knowing the side effects to look out for is important to your care.

Unknown side effects (Frequency not attainable from data):

  • Bloating
  • Bowel obstruction
  • Difficulty swallowing
  • Flatulence

These side effects are usually mild and go away with continued use of Fybogel.

This is not a complete list of side effects. Further information regarding the safety of Fybogel, including a full list of side effects, can be found within the patient information leaflet supplied with your medicine.

If you experience any side effects, regardless of whether they are listed above or in the patient information leaflet, inform your doctor.

Allergic reaction

Do not take Fybogel if you are allergic to ispaghula husk, mebeverine or any of Fybogel's ingredients listed in the patient information leaflet.

If you experience an allergic reaction after taking Fybogel, stop taking the medicine and seek immediate medical attention by going straight to your nearest accident and emergency department. Remember to take the packaging and any remaining medicine with you, so that doctors treating you know exactly what you have taken.

Signs of allergic reaction include:

  • Breathing difficulty
  • Facial swelling
  • Itching
  • Redness of the eyes
  • Runny nose

Pregnancy and breastfeeding

Fybogel original and Fybogel Hi-Fibre may be used by pregnant and breastfeeding women.

If you are pregnant, think you might be pregnant, or breastfeeding, speak to your doctor before taking Fybogel. Your doctor can assess the risks and determine whether the benefits of taking Fybogel outweigh the risks posed to you and your child.

Other safety information

If you have any questions or concerns about Fybogel or your condition, you can speak in confidence to one of our online doctors via our online messaging system.

Please inform our medical team of all medicines you are currently taking, including those prescribed by your doctor, bought over the counter, as well as health and herbal supplements.

While taking Fybogel, ensure you remain hydrated by drinking between 6 and 8 glass of water a day.

Be careful when opening Fybogel sachets as inhalation of the granules can cause an allergic response.

Store Fybogel sachets below 30°C in a dry place.

Do not take Fybogel past the expiry dated printed on the packaging. The date refers to the last day of the specified month. For example, “EXP: 03/2025” refers to the 31st of March 2025.

Never dispose medicines via household or water waste. Ask your local pharmacy to dispose any unwanted or expired medicines on your behalf. These measures help to protect the environment.

Always store Fybogel out from the sight and reach from children and pets.

Never share your medicine with anybody else, even if they are experiencing the same symptoms or have the same condition as you.

Frequently asked questions

Why should you not take Fybogel before bed?

Taking Fybogel less than an hour before bed may cause a blockage in the gut and worsen your constipation.

Can I drink alcohol while taking Fybogel?

While an interaction between Fybogel and alcohol is unlikely, it may not be suitable to drink alcohol if you have bowel problems.

It may also be suitable to cut down on your intake of caffeine, salt, sugar and fat while suffering constipation.

Can I drive or operate machinery after taking Fybogel?

It is not known whether Fybogel will affect your ability to drive or operate machinery.

If you feel dizzy, tired or notice any changes to your vision after taking Fybogel, you should not drive or operate machinery until you feel safe to do so.

Will Fybogel affect my contraceptive pill?

It is unlikely that Fybogel will affect your contraception.

However, if you experience severe diarrhoea lasting longer than 24 hours, read the patient information leaflet which comes with your contraceptive pill to find out what to do in this situation.

Can I take Fybogel everyday?

Fybogel should be taken for as long as your constipation lasts, or for as long as your doctor has prescribed it.

Most people will only need to take Fybogel for up to 1 week. If your condition does not improve after taking Fybogel for 1 week, speak to your doctor.

It is safe to take Fybogel for a longer amount of time. Your doctor may recommend taking Fybogel regularly to increase your intake of fibre.

Can I take Fybogel alongside IBS treatment?

Yes, you can take Fybogel and IBS treatments like Buscopan together.

If you are unsure whether Fybogel is safe to take with any other medicine, speak to your doctor or a pharmacist.

Will Fybogel help me lose weight?

Fybogel and other laxatives do not help you lose weight.

If you are looking to lose weight, our online pharmacy has a range of weight loss treatments. You can complete a consultation with one of our online doctors to determine your suitability.

Is Fybogel available over the counter?

Fybogel original and Fybogel Hi-fibre are available over the counter from most pharmacies, including online pharmacies like Prescription Doctor.

Treatment information

  • Product Name: Fybogel
  • Manufacturer: Reckitt Benckiser
  • Active Ingredient(s): Ispaghula husk
  • Administration: Oral
  • Presentation: Powder
  • Available Strength: 3.5g
  • Exemption: General Sales License
  • Dosage: 2 sachets a day
  • Description: Fybogel is a bulk-forming laxative used to treat constipation
  • Drug Class: Laxative
  • Alcohol Consumption: No influence, though may worsen constipation symptoms
  • When Pregnant: Safe to use during pregnancy. Speak to your doctor for further information.
  • When Breastfeeding: Safe to use while breastfeeding. Speak to your doctor for further information.
  • Price: 4.63 GBP
Click here to view the Fybogel - Patient Information Leaflet

Authored & Reviewed By

Adil Bhaloda

Adil Bhaloda

Adil provides governance for the online services, overseeing prescription dispensation in line with UK pharmacy standards.

Published on: 09/04/2021 Reviewed on: 13/03/2024

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