What Is Vemlidy? Uses, Dosage, and What You Need to Know in 2026

Vemlidy is a brand-name prescription medication made by Gilead Sciences. Its active ingredient is tenofovir alafenamide (TAF) — a newer, more targeted form of tenofovir that treats chronic hepatitis B virus (HBV) infection. This guide covers what Vemlidy is approved for, how to take it, what makes it different from older hepatitis B drugs, and what patients and families should know.

What Is Vemlidy Approved to Treat?

Vemlidy is FDA-approved to treat chronic hepatitis B virus (HBV) infection in:

Adults with compensated liver disease (approved in November 2016)

Adolescents 12 years and older with compensated liver disease (expanded in 2022)

Children 6 years and older weighing at least 25 kg (55 lbs) with compensated liver disease (expanded in 2024)

Vemlidy is NOT approved to treat HIV infection by itself. Patients who have both HIV and hepatitis B (coinfection) must not use Vemlidy alone — they need a complete antiretroviral regimen for HIV treatment.

What Exactly Is Hepatitis B?

Hepatitis B is a liver infection caused by the hepatitis B virus (HBV). Chronic hepatitis B — meaning HBV infection that lasts more than 6 months — affects roughly 296 million people worldwide and about 2.4 million in the United States. Left untreated, chronic hepatitis B can lead to:

Cirrhosis (severe scarring of the liver)

Liver cancer (hepatocellular carcinoma)

Liver failure requiring transplant

Vemlidy doesn't cure hepatitis B or clear the virus from the body in most patients, but it very effectively suppresses HBV replication — keeping viral levels undetectable in 91–97% of patients at 8 years — which prevents liver damage and progression.

How Is Vemlidy Different from Older Hepatitis B Drugs?

Vemlidy represents a significant advancement over tenofovir disoproxil fumarate (TDF/Viread), the older tenofovir-based drug. Vemlidy delivers tenofovir more efficiently to liver cells through a targeted prodrug mechanism — meaning you only need 25 mg of TAF to achieve the same antiviral effect as 300 mg of TDF. The result is:

Better kidney safety — much lower blood tenofovir concentrations mean less kidney stress

Better bone safety — less bone mineral density loss compared to TDF

Equal antiviral efficacy — Vemlidy and TDF suppress HBV DNA equally well; in 8-year studies, Vemlidy maintained 91–97% viral suppression with no resistance development

Vemlidy Dosage: How to Take It

The standard dosage of Vemlidy is:

Dose: One 25 mg tablet, taken orally once daily

With food: Vemlidy MUST be taken with a meal. Food increases absorption and reduces gastrointestinal side effects.

Same dose for children: One 25 mg tablet once daily for patients ≥6 years and ≥25 kg — same dose as adults

Renal impairment: Not recommended for patients with eGFR <15 mL/min not on dialysis. On dialysis days, take Vemlidy after the hemodialysis session.

Hepatic impairment: Not recommended for patients with decompensated liver disease (Child-Pugh B or C)

Is Vemlidy a Controlled Substance?

No. Vemlidy is not a controlled substance and has no DEA schedule. It does not have abuse or dependence potential. There are no refill restrictions based on controlled substance regulations — your prescription is governed only by your insurance plan's rules and your doctor's prescribing decisions.

What Tests Do You Need Before Starting Vemlidy?

HIV test — required before starting Vemlidy; it must not be used as the sole treatment in HIV-positive patients

Kidney function — serum creatinine, eGFR, urine glucose, urine protein

Hepatitis B labs — HBsAg, HBeAg, HBV DNA viral load, liver function tests (ALT, AST)

How Much Does Vemlidy Cost?

At retail prices without insurance or assistance, Vemlidy costs approximately $1,500–$1,800 per month. There is no US-marketed generic as of early 2026. However, most commercially insured patients can access Gilead's co-pay assistance program and pay $0 per month. Uninsured patients may qualify for free medication through Gilead Advancing Access (gileadadvancingaccess.com).

For a full breakdown of cost-saving options, see: How to Save Money on Vemlidy in 2026.

Where to Fill Your Vemlidy Prescription

Vemlidy is not routinely stocked at most retail pharmacies. Use a specialty pharmacy or medfinder to find a pharmacy near you with Vemlidy in stock.