On 19 October 2026, the U.S. Food and Drug Administration (FDA) granted final approval to Zydus Lifesciences for its Abbreviated New Drug Application (ANDA) for Estradiol and Levonorgestrel Transdermal System, delivering 0.045 mg/0.015 mg per day. The FDA publicly announced the approval on 20 October 2026. The once-weekly patch is therapeutically equivalent to Bayer’s Climara Pro Transdermal System, the reference listed drug.
Hormone Therapy and the Patch
Estradiol is an estrogen, while levonorgestrel is a progestogen. The patch delivers both hormones through the skin. Its approved uses are treatment of moderate to severe vasomotor symptoms caused by menopause and prevention of postmenopausal osteoporosis in women with an intact uterus. Vasomotor symptoms include hot flushes and night sweats. The progestogen component helps protect the endometrium, the lining of the uterus, against hyperplasia associated with estrogen use.
Generic Drug Approval and Exclusivity
An ANDA is a US regulatory application used to seek approval for a generic medicine by establishing its equivalence to a reference listed drug. FDA generic-drug requirements include the same active ingredients, strength, dosage form and route of administration as the reference product, along with evidence of bioequivalence. Zydus’s application received a Competitive Generic Therapy designation. The product is eligible for a 180-day exclusivity period upon first commercial marketing, subject to the provisions of the US Federal Food, Drug, and Cosmetic Act.
Manufacturing and Market Data
Zydus plans to manufacture the patch at its plant in Moraiya, near Ahmedabad, Gujarat. US annual sales for the Estradiol and Levonorgestrel Transdermal System were approximately US$45.7 million, based on IQVIA MAT figures for August 2026 cited by Zydus. MAT refers to moving annual total, a measure of sales over a 12-month period.
Important Facts for Exams
- The FDA regulates the approval of medicines for marketing in the United States.
- An ANDA is the application pathway used for many generic drug approvals in the United States.
- Estradiol belongs to the estrogen class of hormones, and levonorgestrel is a progestogen.
- The endometrium is the inner lining of the uterus, and osteoporosis is a condition involving reduced bone strength.
The Zydus patch is a transdermal combination product containing estradiol and levonorgestrel. Its stated strength is 0.045 mg/0.015 mg per day, with once-weekly application.
