Legal status · Canada
Is Hydralazine legal in Canada?
Written by Aaron CuhaReviewed Sep 2026
Direct answer
Yes. Hydralazine is an approved medicine in Canada, classified as "Health Canada approved, prescription only". 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, no human study is cited on its profile.
Hydralazine in Canada at a glance
| Classification | Health Canada approved, prescription only |
|---|---|
| Health Canada approval status | Approved by Health Canada for its labeled use |
| Human studies cited | 0 of 1 citations on the profile |
| Reviewed | Sep 2026 |
Classification and note come from the Hydralazine profile, checked against Health Canada, Health Products and Food Branch (Health Canada) listings at the reviewed date.
What this means
- 01
Health Canada has approved Hydralazine for at least one labeled indication, so a pharmaceutical-grade product exists in Canada 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 Hydralazine is
An old blood pressure drug that extended lifespan in worms by activating the same stress pathway as dietary restriction. In mice it did nothing, in either sex.
Hydralazine is a direct vasodilator that has been used for high blood pressure since the 1950s. Its appearance in ageing research came from an unexpected direction: screens in the nematode Caenorhabditis elegans found it extended lifespan and increased stress resistance, working through the worm equivalent of the NRF2 antioxidant response pathway, which is one of the pathways dietary restriction uses.
Mechanism: Two separate mechanisms that should not be confused. Clinically it is a direct arteriolar vasodilator, reducing peripheral resistance and lowering blood pressure, with reflex tachycardia and fluid retention as consequences, which is why it is usually combined with a beta blocker and a diuretic.
Regulatory history: FDA-approved for hypertension, and used in heart failure in combination with isosorbide dinitrate. No ageing indication.
How Health Canada treats this kind of product
Authorises drugs for sale through a Notice of Compliance and Drug Identification Number. A compound that is not authorised for sale cannot lawfully be sold for human use, and personal importation of prescription drugs is limited.
The classification above is the The Longevity Archive reading of Health Canada, Health Products and Food Branch listings for Hydralazine 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.
Hydralazine in other countries
Frequently asked questions
Is Hydralazine legal in Canada?
Yes. Hydralazine is an approved medicine in Canada, classified as "Health Canada approved, prescription only". 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, no human study is cited on its profile.
Can I buy Hydralazine in Canada?
Only with a prescription. Hydralazine is classified as "Health Canada approved, prescription only" in Canada, 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.
Is Hydralazine Health Canada approved?
Yes, for its labeled indication. In Canada Hydralazine is classified as "Health Canada approved, prescription only". For comparison, the US FDA status is: FDA-approved for hypertension, and used in heart failure in combination with isosorbide dinitrate. No ageing indication.. On the evidence, no human study is cited on its profile.
Related compounds in Canada
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for Hydralazine live on its compound profile.
Hydralazine profileThis page is general information about the regulatory status of Hydralazine in Canada, current as of Sep 2026. It is not legal advice, and classifications change; check Health Canada, Health Products and Food Branch 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.