Fosentin 75mg Injection

Reviewed By Dr. Mekhala Chandra, MD, MBBS

Last updated on 23 Jan 2026 | 10:15 AM (IST)

Fosentin 75mg Injection is used for the treatment of epilepsy (seizures). It controls seizures by decreasing the abnormal and excessive activity of the nerve cells in the brain.

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General Information

Contains

Fosphenytoin (75mg)

Marketer

Sun Pharmaceutical Industries Ltd

Storage

Store in a refrigerator (2 - 8°C). Do not freeze.

The content is shown in English

Product introduction

Fosentin 75mg Injection is given under the supervision of a healthcare professional and should not be self-administered. You should never skip any doses and finish the full course of treatment even if you feel better as stopping the medication without talking to the doctor may cause non-stop seizures and can endanger life. Be careful if you are using birth control pills as this medicine may interfere with the working of contraceptives.

Fosentin 75mg Injection may cause a few side effects such as vomiting, itching, impaired coordination, and involuntary eye movement (nystagmus). It may also cause dizziness and sleepiness in some people, so do not drive or do anything that requires mental focus. Additionally, you may notice some injection site reactions like redness or swelling. Most side effects wear off, but if they bother you or do not go away, tell your doctor. There may be ways of preventing or reducing these effects.

Uses of Fosentin Injection

Benefits of Fosentin Injection

Epilepsy/Seizures
Fosentin 75mg Injection is an anticonvulsant (or anti-epileptic) medicine that works by decreasing the nerve impulses which cause the seizures. By controlling the frequency of seizures, it will help you go about your daily activities with more confidence. It helps reduce symptoms such as confusion, uncontrollable jerking movements, loss of awareness, and fear or anxiety.
This medicine is not associated with any physical or psychological dependence (addiction) but it should not be stopped suddenly. It is given by your healthcare provider and should not be self-administered. It must be taken regularly as prescribed to be effective. Missing doses may trigger a seizure.

Side effects of Fosentin Injection

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 Fosentin

Injection site reactions (pain, swelling, redness)
Vomiting
Sleepiness
Dizziness
Itching
Impaired coordination
Nystagmus (involuntary eye movement)

How to use Fosentin Injection

Your doctor or nurse will give you this medicine. Kindly do not self administer.

How Fosentin Injection works

Fosentin 75mg Injection is an antiepileptic medication. It controls seizures or fits by decreasing the abnormal and excessive activity of the nerve cells in the brain.

All substitutes for Fosentin 75mg Injection

For information purposes only. Consult a doctor before taking any medicine.

Neofost 75mg Injection

by Neon Laboratories Ltd

₹45.94/injection

51% costlier

Quick tips

It is given as an injection either into a vein (intravenously) or into a muscle (intramuscularly).
Take your medication regularly as directed by your doctor as missing doses can trigger seizures.
Do not change the brand of your medicine and make sure that you have sufficient amount of medicine present with you.
Some healthy tips to prevent seizures:
- Practice yoga every day.
- Get enough sleep at nighttime.
- Limit the use of screen time such as mobile/laptop.
- Take your medication on time.
It may cause dizziness and sleepiness. Do not drive or do anything that requires mental focus until you know how it affects you.
It may increase blood sugar levels.Inform your doctor if you are taking any medicines to treat diabetes.
Inform your doctor if you develop any unusual changes in mood or behavior, new or worsening depression, or suicidal thoughts or behavior.
Fosentin 75mg Injection helps in the treatment and prevention of seizures.
Take it at the same time every day to maintain consistent levels in your body.
It may cause dizziness and sleepiness. Do not drive or do anything that requires mental focus until you know how it affects you.
Avoid consuming alcohol when taking Fosentin 75mg Injection, as it may cause excessive sleepiness or drowsiness.
Monitor your weight during treatment with this medicine as it can cause weight gain.
Inform your doctor if you develop any unusual changes in mood or behavior, new or worsening depression, or suicidal thoughts or behavior.
Do not take Fosentin 75mg Injection if you are pregnant or planning to conceive or breastfeeding.
Do not stop taking the medication suddenly without talking to your doctor as it may increase the seizure frequency.
Take your medication regularly as directed by your doctor as missing doses can trigger seizures.
Do not change the brand of your medicine and make sure that you have sufficient amount of medicine present with you.
Some healthy tips to prevent seizures:
- Practice yoga every day.
- Get enough sleep at nighttime.
- Limit the use of screen time such as mobile/laptop.
- Take your medication on time.
It may increase the risk of low sodium levels in the blood. Inform your doctor if you develop difficulty concentrating, memory problems, confusion, weakness, and unsteadiness.
Talk to your doctor if you notice sudden mood changes or develop suicidal thoughts.

Safety advice

Alcohol

CAUTION

Alcohol should be used with caution while taking Fosentin 75mg Injection.

Pregnancy

UNSAFE

Fosentin 75mg Injection is highly unsafe during pregnancy. It can cause serious harm to the unborn baby, including birth defects and pregnancy loss. Do not use this medicine if you are pregnant or planning to become pregnant.

Breast feeding

CAUTION

Fosentin 75mg Injection should be used with caution during breastfeeding. Breastfeeding should be held until the treatment of the mother is completed and the drug is eliminated from the body.
Please consult your doctor.

Driving

UNSAFE

Fosentin 75mg Injection may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.

Kidney

CAUTION

Fosentin 75mg Injection should be used with caution in patients with kidney disease. Dose adjustment may be needed.
However, talk to your doctor if you have any underlying kidney disease.

Liver

CAUTION

Fosentin 75mg Injection should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

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

Severe

Ticagrelor (Oral Route)

Do not consume Ticagrelor with Fosphenytoin. Fosphenytoin may reduce blood levels of Ticagrelor.

Severe

Ranolazine (Oral Route)

Do not consume Ranolazine with Fosphenytoin. Fosphenytoin may reduce blood levels and efficacy of Ranolazine.

Severe

Bortezomib (Injection Route)

Avoid concurrent use. Please consult with your doctor. Fosphenytoin may reduce efficacy of Bortezomib.

Severe

Irinotecan (Injection Route)

Do not consume Irinotecan with Fosphenytoin. If concurrent use is essential, please consult your doctor. Fosphenytoin may fasten the elimination of Irinotecan and its active form.

Severe

Aprepitant (Oral Route)

Do not consume Aprepitant with Fosphenytoin. Fosphenytoin may reduce blood levels of Aprepitant.

Frequently asked questions

For how long does Fosentin 75mg Injection stay in your system?

On an average, Fosentin 75mg Injection may stay in your system for 5-6 days. This duration varies from person to person. In some cases, it may stay for about 9-10 days.

Why is Fosentin 75mg Injection better than phenytoin?

Fosentin 75mg Injection does not have side effects which are commonly associated with the use of phenytoin such as injection site irritation and sudden changes in the heart rate (arrhythmia), hence Fosentin 75mg Injection is better than phenytoin.

What happens if I stop taking Fosentin 75mg Injection?

Suddenly stopping Fosentin 75mg Injection may cause non-stop seizures (called status epilepticus), which can endanger life. Hence, do not stop taking the medicine without consulting your doctor. If required, your doctor may slowly reduce the dose before stopping it completely.

What are the symptoms that occur if I take more than the recommended dose of Fosentin 75mg Injection? Can I die from Fosentin 75mg Injection overdose?

Overdose of Fosentin 75mg Injection may cause jerky movements of the eyes (nystagmus), unclear speech, loss of balance, tremor, muscle stiffness or weakness, nausea, vomiting, lightheadedness, fainting, blurred vision, slow and shallow breathing and even coma. Fosentin 75mg Injection overdose can cause very low blood pressure and respiratory problems. As a result of this, the patient can even die.

What are the effects of Fosentin 75mg Injection on children?

The most common side effects related to Fosentin 75mg Injection in children are jerky movements of the eyes (nystagmus) and overgrowth of the gums. In some children, Fosentin 75mg Injection causes problems with thinking or behavior, mood change, slow or clumsy movements, or a loss of energy. Other side effects from high doses include unsteadiness in the feet and hands, sleepiness, and vomiting. These may be avoidable if the dose is increased slowly. These side effects quickly disappear when the dose is reduced.

Does Fosentin 75mg Injection affect birth control?

Fosentin 75mg Injection does affect birth control. Fosentin 75mg Injection can decrease the effect of oral contraceptives (birth control pills) which can make the contraceptive (birth control) effect unreliable. Please talk to your doctor if you are asked to take the two medicines together as you may need to use extra protection for birth control.

Does Fosentin 75mg Injection make you sleepy?

Fosentin 75mg Injection can make you feel sleepy (sedation, somnolence, and drowsiness). Please consult your doctor if you feel very sleepy after taking Fosentin 75mg Injection, especially during the first few weeks of treatment or following a dose increase. Talk to your doctor as you may be advised not to drive or use machines until it is established that your ability to perform such activities is not affected.

Does Fosentin 75mg Injection cause weight gain?

No, Fosentin 75mg Injection has not been reported to cause weight gain. However, weight loss can occur with longer term use of a higher dose of Fosentin 75mg Injection. Please consult your doctor if you experience weight gain after taking Fosentin 75mg Injection.

Fact Box

Chemical Class

Diphenylmethanes

Habit Forming

Therapeutic Class

NEURO CNS

Action Class

Sodium Channel Modulators- Antiepileptic drugs (AEDs)

References

Porters RJ, Meldrum BS. Antiseizure Drugs. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. p. 403.
Fosphenytoin sodium [EMC SmPC]. Sandwich, Kent: Pfizer Limited; 2004 [revised Nov. 2018]. [Accessed 02 Mar. 2020] (online) Available from:
Fosphenytoin Sodium Injection [FDA Label]. New York, NY: Pfizer Labs; 2015. [Accessed 02 Mar. 2020] (online) Available from:
Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006. Fosphenytoin. [Updated 2018 Dec 3]. [Accessed 20 Feb. 2020] (online) Available from:
Central Drugs Standard Control Organisation (CDSCO). [Accessed 25 Mar. 2019] (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: Sun Pharmaceutical Industries Ltd
Address: Khasra No. 1335-1340,Near EPIP- I, Vill - Bhatoli Kalan ,Baddi, Solan, Himachal Pradesh, 173205 || Plot no 107/108,Namli block , Ranipool, East Sikkim 737135

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Fosentin 75mg Injection

Save more with additional offers

General Information

Contains

Marketer

Storage

Product introduction

Uses of Fosentin Injection

Benefits of Fosentin Injection

Side effects of Fosentin Injection

How to use Fosentin Injection

How Fosentin Injection works

All substitutes for Fosentin 75mg Injection

Neofost 75mg Injection

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Ticagrelor (Oral Route)

Ranolazine (Oral Route)

Bortezomib (Injection Route)

Irinotecan (Injection Route)

Aprepitant (Oral Route)

Frequently asked questions

For how long does Fosentin 75mg Injection stay in your system?

Why is Fosentin 75mg Injection better than phenytoin?

What happens if I stop taking Fosentin 75mg Injection?

What are the symptoms that occur if I take more than the recommended dose of Fosentin 75mg Injection? Can I die from Fosentin 75mg Injection overdose?

What are the effects of Fosentin 75mg Injection on children?

Does Fosentin 75mg Injection affect birth control?

Does Fosentin 75mg Injection make you sleepy?

Does Fosentin 75mg Injection cause weight gain?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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