Phenytoin (phenytoin) — Uses, Dosage, Side Effects & Safety
Drug class: Anticonvulsant (Hydantoin derivative)
Overview
Phenytoin is a prescription medication used to control certain types of seizures, including tonic-clonic (grand mal) and complex partial seizures. It is not typically used for absence (petit mal) seizures. Phenytoin helps stabilize electrical activity in the brain, reducing the frequency and severity of seizures. Phenytoin works by slowing down impulses in the brain that cause seizures. It is important for patients to take this medication exactly as prescribed and not to stop it suddenly, as this can increase the risk of seizures. Regular blood tests may be needed to monitor drug levels and prevent side effects. Key points: Take phenytoin at the same time each day, do not skip doses, and inform your healthcare provider about all other medicines you are taking. Notify your doctor if you experience any unusual symptoms or side effects.
Therapeutic uses
- Tonic-clonic seizures (grand mal)
- Complex partial seizures (psychomotor seizures)
- Status epilepticus (prevention and treatment)
- Trigeminal neuralgia (off-label)
Common side effects
- Gingival hyperplasia
- Nystagmus
- Ataxia
- Drowsiness
- Hirsutism
- Megaloblastic anemia
- Stevens-Johnson syndrome
Frequently Asked Questions about Phenytoin
What is phenytoin used for?
Phenytoin is primarily used to control and prevent certain types of seizures, including tonic-clonic (grand mal) and complex partial seizures.
How long does it take for phenytoin to work?
Phenytoin may begin to reduce seizure frequency within a few days, but it may take several weeks to achieve full effect and stable blood levels.
Can I drink alcohol while taking phenytoin?
It is best to avoid alcohol, as it can increase side effects and the risk of seizures.
What should I do if I develop a rash while taking phenytoin?
Stop taking phenytoin and contact your doctor immediately, as a rash can be a sign of a serious reaction.
Is phenytoin safe during pregnancy?
Phenytoin may increase the risk of birth defects. Discuss risks and benefits with your doctor if you are pregnant or planning to become pregnant.
Do I need regular blood tests while on phenytoin?
Yes, regular blood tests are important to monitor phenytoin levels and prevent toxicity.
Can phenytoin affect my gums?
Yes, phenytoin can cause gum overgrowth (gingival hyperplasia). Good oral hygiene and regular dental check-ups are recommended.
Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.