Sold as Lantus, Basaglar, Semglee, Toujeo. Type 1 and type 2 diabetes.
What it should cost to fill
Strength
Cash price
With a discount card
10 mL vial (100 units/mL)
$35 – $300
$35 – $120
Box of 5 pens
$90 – $450
$70 – $200
Typical retail ranges, not quotes. What you are charged depends on the pharmacy and on how the claim is processed — which is exactly why it is worth asking.
Where the money goes
Capped at $35 a month for Medicare Part D. Several states cap it for commercial plans too.
Every major manufacturer runs a patient assistance programme, and Lilly and Novo Nordisk both cap out-of-pocket insulin at $35 through their own savings cards regardless of insurance.
Ask specifically for the biosimilar. The price gap is large and the drug is interchangeable.
What else there is
Not recommendations. The tradeoff matters more than the name, and it is the part a prescriber will want to talk about.
Biosimilar glargine (Semglee, Rezvoglar)Different class
Interchangeable with Lantus and substantially cheaper. A pharmacist can often substitute directly.
NPH insulin (Humulin N, Novolin N)Different class
Available for around $25 a vial without a prescription in most states. It behaves differently — a pronounced peak, so a higher risk of low blood sugar overnight — and it is not a like-for-like swap. A real option in a crisis, a conversation with your doctor otherwise.
Worth asking
Can I be switched to a biosimilar glargine?
Can you help me enrol in the manufacturer’s $35 programme?
Before you change anything. Never ration insulin. If you cannot afford your next vial, tell your doctor or pharmacist that day — emergency supplies and assistance programmes exist for exactly this.