Phentin 300 SR Tablet is a prescription medicine used to treat and prevent epilepsy (seizures). It controls seizures by decreasing the abnormal and excessive activity of the nerve cells in the brain.Phentin 300 SR Tablet can be used alone or in combination with other medicines. It may be taken with or without food. Your doctor will decide the correct dose for you. This may increase gradually until your condition is stable. This medicine may take several weeks to work but it is important to take it regularly to get the benefit. Do not stop taking it, even if you feel fine, unless your doctor advises you to. You may have more seizures, or your bipolar disorder may get worse.The most common side effects of this medicine include skin rashes, headache, feeling or being sick, difficulty sleeping, dizziness, and feeling sleepy or drowsy. 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.Before taking this medicine, tell your doctor if you have kidney or liver problems, meningitis or depression, or suicidal thoughts. Also let your healthcare team know about all other medications you are using as some may affect, or be affected by, this medicine, including contraceptive pills. If you are pregnant or breastfeeding, the dose may be adjusted. You should avoid driving or riding a bicycle if this medicine makes you drowsy or dizzy. You may need frequent blood tests to check how you are responding to this medicine.
Written by: Syeda Jigni Mehraj, B pharmacy
Reviewed by: Dr. Jay Faldu, MBBS
Last updated on: 24-06-2025
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Phentin 300 SR Tablet is a prescription medicine used to treat and prevent epilepsy (seizures). It controls seizures by decreasing the abnormal and excessive activity of the nerve cells in the brain.Phentin 300 SR Tablet can be used alone or in combination with other medicines. It may be taken with or without food. Your doctor will decide the correct dose for you. This may increase gradually until your condition is stable. This medicine may take several weeks to work but it is important to take it regularly to get the benefit. Do not stop taking it, even if you feel fine, unless your doctor advises you to. You may have more seizures, or your bipolar disorder may get worse.The most common side effects of this medicine include skin rashes, headache, feeling or being sick, difficulty sleeping, dizziness, and feeling sleepy or drowsy. 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.Before taking this medicine, tell your doctor if you have kidney or liver problems, meningitis or depression, or suicidal thoughts. Also let your healthcare team know about all other medications you are using as some may affect, or be affected by, this medicine, including contraceptive pills. If you are pregnant or breastfeeding, the dose may be adjusted. You should avoid driving or riding a bicycle if this medicine makes you drowsy or dizzy. You may need frequent blood tests to check how you are responding to this medicine.
Treatment and prevention of Epilepsy/Seizures
In Treatment and prevention of Epilepsy/Seizures : Phentin 300 SR Tablet 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 must be taken regularly as prescribed to be effective. Missing doses may trigger a seizure.
Side effects of Phentin Tablet SRThe majority of side effects typically do not necessitate medical intervention. and disappear as your body adjusts to the medicine. Doctor consultation is advised if they persist or if you�re worried about them Common side effects of Phentin Rash Headache Dizziness Vomiting Nausea Slurred speech Vertigo Confusion Nervousness Constipation Tremors Altered walking
How to use Phentin Tablet SRFollow your doctor's guidance regarding the dose and duration of this medication. Ingest it without breaking or crushing. Do not chew, crush or break it. Phentin 300 SR Tablet can be taken it with or without food, although it's advisable to take it consistently at the same time.
How Phentin Tablet SR works Phentin 300 SR Tablet is an antiepileptic medication. It controls seizures or fits by decreasing the abnormal and excessive activity of the nerve cells in the brain.
Alcohol
Unsafe: Avoid consuming alcohol with Phentin 300 SR Tablet as it is deemed unsafe.
Pregnancy
Phentin 300 SR Tablet is unsafe to use during pregnancy as there is definite evidence of risk to the developing baby. However, the doctor may rarely prescribe it in some life-threatening situations if the benefits are more than the potential risks. Doctor consultation is advised.
Breast feeding
Phentin 300 SR Tablet is safe to use during breastfeeding. Human studies suggest that the drug does not pass into the breastmilk in a significant amount and is not harmful to the baby.Doctor consultation is advised.
Driving
Phentin 300 SR Tablet may decrease alertness, affect your vision or make you feel sleepy and dizzy. Do not drive if these symptoms occur.
Kidney
Phentin 300 SR Tablet should be used with caution in patients with kidney disease. Dose adjustment of Phentin 300 SR Tablet may be needed. Doctor consultation is advised.
Liver
Phentin 300 SR Tablet should be used with caution in patients with liver disease. Dose adjustment of Phentin 300 SR Tablet may be needed. Doctor consultation is advised.
If a dose of Phentin 300 SR Tablet is missed, take it promptly. However, if your next dose is approaching, skip the missed dose and resume your regular schedule. Avoid doubling the dose.
Store in a cool and dry place, and keep the temperature below 30�C
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. It may cause swollen gum (gum hypertrophy), hence take care of oral or dental hygiene. Talk to your doctor if you notice sudden mood changes or develop suicidal thoughts. Do not stop taking the medication suddenly without talking to your doctor as it may increase the seizure frequency.
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