Legal status · United Kingdom
Is Danazol legal in the United Kingdom?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Yes. Danazol is an approved medicine in the United Kingdom, classified as "Licensed, prescription only (MHRA)". Approval covers its labeled indication and it is supplied on prescription, not over the counter. Products labeled "research use only" fall outside that approval and the label does not make human use lawful. On the evidence, 5 human studies are cited on its profile.
Danazol in the United Kingdom at a glance
| Classification | Licensed, prescription only (MHRA) |
|---|---|
| Note | Licensed prescription medicine; the telomere indication is not licensed anywhere. |
| MHRA approval status | Approved by MHRA for its labeled use |
| Human studies cited | 5 of 5 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Danazol profile, checked against Medicines and Healthcare products Regulatory Agency (MHRA) listings at the reviewed date.
What this means
- 01
MHRA has approved Danazol for at least one labeled indication, so a pharmaceutical-grade product exists in the United Kingdom and is dispensed on prescription.
- 02
Approval is indication-specific. Uses outside the label are a clinical decision for a prescriber, not something the approval itself authorizes.
- 03
Unlicensed online vials, including those labeled "research use only", are not the approved product and are not covered by the approval.
What Danazol is
The one compound here that produced telomere lengthening in humans: 11 of 12 evaluable patients gained telomere length, a mean 386 base pairs at 24 months, in a phase 1 to 2 study stopped early. All 27 patients had inherited telomere disease, telomere length is a biomarker, and nobody measured lifespan.
Danazol is a synthetic androgen licensed decades ago for endometriosis, fibrocystic breast disease and hereditary angioedema. It reached ageing research through haematology, where androgens have long been used for bone marrow failure, and where somebody noticed that sex hormones regulate expression of the telomerase gene in cell and animal models.
Mechanism: A synthetic derivative of ethisterone with weak androgenic activity, which suppresses the pituitary gonadal axis and binds androgen, progesterone and glucocorticoid receptors. The telomere rationale is separate from its licensed pharmacology: sex hormones upregulate expression of TERT, the catalytic subunit of telomerase, in tissue culture and animal models, and androgens are aromatised to estrogens which act on an estrogen response element in the TERT promoter.
Regulatory history: FDA approved for endometriosis, fibrocystic breast disease and hereditary angioedema, with a boxed warning. Not approved for telomere disease, ageing or any longevity indication. Its use in telomere biology disorders is off label and was studied under an investigational protocol.
How MHRA treats this kind of product
Licenses medicines for the UK market. A compound without a marketing authorisation is an unlicensed medicine, which can only lawfully be supplied for human use through a prescriber under the specials scheme, not sold as a research product.
The classification above is the The Longevity Archive reading of Medicines and Healthcare products Regulatory Agency listings for Danazol at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.
Danazol in other countries
Frequently asked questions
Is Danazol legal in the United Kingdom?
Yes. Danazol is an approved medicine in the United Kingdom, classified as "Licensed, prescription only (MHRA)". Approval covers its labeled indication and it is supplied on prescription, not over the counter. Products labeled "research use only" fall outside that approval and the label does not make human use lawful. On the evidence, 5 human studies are cited on its profile. Note: Licensed prescription medicine; the telomere indication is not licensed anywhere.
Can I buy Danazol in the United Kingdom?
Only with a prescription. Danazol is classified as "Licensed, prescription only (MHRA)" in the United Kingdom, so it is dispensed by pharmacies against a prescription for its approved indication. Buying it from unlicensed online sellers or as a "research chemical" is outside that system and carries no regulatory protection. Note: Licensed prescription medicine; the telomere indication is not licensed anywhere.
Is Danazol MHRA approved?
Yes, for its labeled indication. In the United Kingdom Danazol is classified as "Licensed, prescription only (MHRA)". For comparison, the US FDA status is: FDA approved for endometriosis, fibrocystic breast disease and hereditary angioedema, with a boxed warning. Not approved for telomere disease, ageing or any longevity indication. Its use in telomere biology disorders is off label and was studied under an investigational protocol.. On the evidence, 5 human studies are cited on its profile.
Related compounds in the United Kingdom
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for Danazol live on its compound profile.
Danazol profileThis page is general information about the regulatory status of Danazol in the United Kingdom, current as of Sep 2026. It is not legal advice, and classifications change; check Medicines and Healthcare products Regulatory Agency directly or consult a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships and does not recommend where to buy anything.