Phenytoin Dosage Guide — Strengths, Titration & Max Dose
Complete dosing reference for Phenytoin (Phenytoin Sodium): available forms and strengths, typical adult dose, titration schedule, max dose, and dosing in special populations.
Verified pharmacies compete for your prescription. Free · No account · Bids in 1–4 hrs.
Chain retail
$25/mo
GoodRx typical
~$15/mo
Via Script Unlock
$5/mo
Save up to 80% — ~$240/year for chronic use.
Phenytoin Dosing
Phenytoin dosing depends on your indication, kidney and liver function, age, and other medications you are taking. Your prescriber selects the starting dose and titrates based on clinical response.
Ask your prescriber for the Phenytoin package insert or the FDA-approved prescribing information for full dosing detail.
Phenytoin pricing varies dramatically by pharmacy
The same Phenytoin prescription can cost $5 at one pharmacy and $25 at another in the same zip code. Chain pharmacies typically charge the most. Script Unlock lets verified independent and mail-order pharmacies compete for your prescription — the winning bid is usually 80% below chain retail.
- Free — no membership, no account, no credit card upfront
- Bids in 1–4 hours from verified US pharmacies
- Locked-in price — no PBM renegotiation at checkout
- Delivery or local pickup
Related Phenytoin pages
Medical disclaimer: Dosage information on this page is for reference only and is not a substitute for medical advice. Your prescribing doctor determines the appropriate Phenytoin dose for your condition, kidney and liver function, other medications, and clinical response.