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Fesobig 8 Tablet ER

Fesoterodine Fumarate (8mg)

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Fesobig 8 Tablet ER is an antispasmodic medicine used to treat overactive bladder in adult patients. It relaxes the bladder muscles and improves their ability to control urination. It also helps to reduce urine leakage and feelings of needing to urinate right away.

Written By Dr. Anuj Saini, MMST, MBBS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 09 Apr 2026 | 04:32 PM (IST)

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General Information

Contains

Fesoterodine Fumarate (8mg)

Marketer

MSN Laboratories

Storage

Store below 25°C

The content is shown in English

Product introduction

Fesobig 8 Tablet ER may be taken with or without food. However, take it in the dose and duration prescribed by your doctor to get the most benefit. It is also advised to take this medicine at the same time each day to avoid missing a dose. Do not not stop taking the medicine without consulting the doctor as it may worsen your symptoms. The course of the treatment should be completed for better efficacy of the medicine.

The most common side effects of Fesobig 8 Tablet ER are dry mouth and constipation. Drinking plenty of water might help you cope with these side effects. Sometimes, Fesobig 8 Tablet ER may also make you feel dizzy or sleepy or blur your vision; in such scenarios, do not drive or do things that require concentration. Consumption of alcohol must be avoided as alcohol can aggravate the side effects of this medication. If any of the side effects persist or get worse, consult the doctor.

Before taking Fesobig 8 Tablet ER, inform your doctor if you are on any other medication or have any other health conditions. You should also inform the doctor if you are pregnant or breastfeeding. Patients with liver or kidney disease must be cautious while receiving the prescription as they require regular follow-ups as per the doctor’s advice.

Uses of Fesobig Tablet ER

Treatment of Overactive bladder (OAB)

Benefits of Fesobig Tablet ER

Treatment of Overactive bladder (OAB)
Overactive bladder (OAB) causes frequent and sudden urges to urinate that may be difficult to control. Patients may feel like they need to pass urine many times during the day and night, and some may also experience unintentional urine release. Fesobig 8 Tablet ER provides relief from these symptoms.

Side effects of Fesobig Tablet ER

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Fesobig

Dryness in mouth
Constipation

How to use Fesobig Tablet ER

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Fesobig 8 Tablet ER may be taken with or without food.

How Fesobig Tablet ER works

Fesobig 8 Tablet ER works by relaxing the bladder muscles to increase the quantity of urine your bladder can hold and preventing them from causing incontinence. This further prevents urgent, frequent, or uncontrolled urination.

Quick tips

Dry mouth may occur as a side effect of Fesobig 8 Tablet ER. Frequent mouth rinses, good oral hygiene, increased water intake, and sugarless candy may help.
Caffeinated drinks like tea, coffee, and cola may make your symptoms worse since caffeine increases urine flow and will make you want to pass urine. If you drink a lot of caffeine-containing drinks, consider switching to decaffeinated alternatives.
Your doctor may suggest that you do some pelvic floor exercises to strengthen the muscles around the underside of your bladder to improve your symptoms.
Avoid drinking too much water before sleeping to reduce the desire to urinate at night, which may lead to disturbed sleep.
Dry mouth may occur as a side effect of Fesobig 8 Tablet ER. Frequent mouth rinses, good oral hygiene, increased water intake, and sugarless candy may help.
Caffeinated drinks like tea, coffee, and cola may make your symptoms worse since caffeine increases urine flow and will make you want to pass urine. If you drink a lot of caffeine-containing drinks, consider switching to decaffeinated alternatives.
Your doctor may suggest that you do some pelvic floor exercises to strengthen the muscles around the underside of your bladder to improve your symptoms.
Avoid drinking too much water before sleeping to reduce the desire to urinate at night, which may lead to disturbed sleep.

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Fesobig 8 Tablet ER. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

Fesobig 8 Tablet ER is not recommended during pregnancy as there is positive evidence of fetal risk based on animal studies. However, it may still be prescribed by a doctor in situations where the benefits outweigh the risks.

Breast feeding

CONSULT YOUR DOCTOR

Fesobig 8 Tablet ER may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.

Driving

UNSAFE

Fesobig 8 Tablet ER may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.

Kidney

CAUTION

Fesobig 8 Tablet ER should be used with caution in patients with kidney disease. Dose adjustment may be needed.

Liver

CAUTION

Fesobig 8 Tablet ER should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking Fesobig with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Severe

Voriconazole (Oral Route)

Do not consume Fesoterodine Fumarate with Voriconazole. Your doctor may monitor your treatment and adjust the doses as per the observations. Voriconazole may raise blood levels of the active form of Fesoterodine Fumarate.

Severe

Voriconazole (Injection Route)

Moderate

Trihexyphenidyl (Injection Route)

Talk to your doctor if you notice any unusual symptoms.

Moderate

Mifepristone (Oral Route)

Watch out for symptoms of Fesoterodine Fumarate side effects such as constipation, abdominal pain, constipation, dry mouth, or body aches, and consult your doctor if you experience them. They may adjust the dose of Fesoterodine Fumarate accordingly. Mifepristone may raise blood levels of Fesoterodine Fumarate.

Moderate

Clozapine (Oral Route)

Watch out for symptoms such as dry mouth, increased heart rate, urination difficulties, constipation, loss of appetite or nausea and consult your doctor if you experience them.

Frequently asked questions

What is Fesobig 8 Tablet ER used for?

Fesobig 8 Tablet ER is used to treat overactive bladder (OAB) in adults. This condition causes a sudden, hard-to-control urge to urinate, frequent bathroom visits, and sometimes urine leakage. The product helps relax the bladder muscles, allowing you to hold urine longer and improve bladder control. It is also prescribed for neurogenic bladder problems in children aged six years and older who have trouble controlling urination due to nerve-related issues.

Can children take Fesobig 8 Tablet ER safely?

Fesobig 8 Tablet ER may be prescribed to children six years old and older who weigh more than 25 kg, and have a neurogenic bladder condition (meaning bladder control issues caused by nerve damage). The dose for children is decided carefully by the doctor based on weight and tolerance.

Who should not take Fesobig 8 Tablet ER?

Individuals should not take Fesobig 8 Tablet ER if they are allergic to it, or any ingredients present in it, have urinary retention (cannot empty the bladder), gastric retention (stomach empties very slowly), or uncontrolled narrow-angle glaucoma. Always tell your doctor about your full medical history before starting this product.

What are the serious warnings and precautions with Fesobig 8 Tablet ER?

Serious risks with Fesobig 8 Tablet ER use include allergic swelling (angioedema) of the face, lips, tongue, or throat, which can cause breathing trouble. It may also lead to urinary retention, worsening constipation, worsening of glaucoma, blurred vision, or drowsiness. If you experience these symptoms, stop the product, and contact your doctor or emergency care immediately.

Can Fesobig 8 Tablet ER cause problems with the eyes?

Fesobig 8 Tablet ER can worsen narrow-angle glaucoma or cause blurred vision in some people. If you notice eye pain, sudden blurred vision, or halos around lights, seek medical help right away. Tell your doctor if you are being treated for glaucoma before starting this product.

Is Fesobig 8 Tablet ER safe for people with bladder or stomach problems?

If you have a bladder blockage, or severe constipation, Fesobig 8 Tablet ER may worsen your condition. This product slows bladder and stomach activity, so people with these problems should use it only under a doctor’s supervision, or may need a different treatment.

What should I do if I get swelling or trouble breathing after taking Fesobig 8 Tablet ER?

If you develop swelling of the face, lips, tongue, or throat, or have trouble breathing, stop taking Fesobig 8 Tablet ER and seek emergency medical help immediately. These could be signs of a severe allergic reaction (angioedema).

Can Fesobig 8 Tablet ER affect my nervous system or alertness?

Yes, Fesobig 8 Tablet ER can cause drowsiness, dizziness, or confusion, especially when you first start it. Avoid driving, operating machines, or doing tasks that require alertness until you know how the product affects you.

Fact Box

Chemical Class

Diphenylmethanes

Habit Forming

Therapeutic Class

UROLOGY

Action Class

Non-Selective Anticholinergics

Related lab tests

Urine Routine & Microscopy

References

Fesoterodine fumarate [Prescribing Information]. New York, NY: Pfizer Labs; 2021. [Accessed 31 May. 2023]. (online) Available from:

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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: MSN Laboratories
Address: MSN House, Plot No: C-24, Industrial Estate, Sanathnagar, Hyderabad - 18 Telangana, 500018 INDIA

Vendor Details

Country of origin: India
A licensed vendor partner from your nearest location will deliver Fesobig 8 Tablet ER. Once the pharmacy accepts your order, the details of the pharmacy will be shared with you. Acceptance of your order is based on the validity of your doctor's ℞ and the availability of this medicine.

In case of any issues, contact us

Email ID: [email protected]
Phone Number: 0124-4166666
Address: 5th Floor Tower - B of the Presidency Building, 46/4 Mehrauli Gurgaon Road, Sector 14, Gurugram, Haryana-122001, India

Lab tests offered by us

Why we need a prescription?

Fesobig 8 Tablet ER

Save more with additional offers

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Fesobig Tablet ER

Benefits of Fesobig Tablet ER

Side effects of Fesobig Tablet ER

How to use Fesobig Tablet ER

How Fesobig Tablet ER works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Voriconazole (Oral Route)

Voriconazole (Injection Route)

Trihexyphenidyl (Injection Route)

Mifepristone (Oral Route)

Clozapine (Oral Route)

Frequently asked questions

What is Fesobig 8 Tablet ER used for?

Can children take Fesobig 8 Tablet ER safely?

Who should not take Fesobig 8 Tablet ER?

What are the serious warnings and precautions with Fesobig 8 Tablet ER?

Can Fesobig 8 Tablet ER cause problems with the eyes?

Is Fesobig 8 Tablet ER safe for people with bladder or stomach problems?

What should I do if I get swelling or trouble breathing after taking Fesobig 8 Tablet ER?

Can Fesobig 8 Tablet ER affect my nervous system or alertness?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Urine Routine & Microscopy

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

In case of any issues, contact us

Lab tests offered by us

Related/Popular tests