Dianabol (methandrostenolone, “Dbol”) is an oral anabolic steroid made in the 1950s to build muscle in athletes. It causes fast gains in size and strength, much of it water at first, and is known for liver strain, high blood pressure and estrogen-related side effects.
- Short half-life of about 3–6 hours.
- Converts to a potent estrogen, causing water retention and gynecomastia risk.
- Liver tests and blood pressure checks are essential.
Dianabol is probably the most famous steroid in bodybuilding history, linked with the “golden era” of the 1960s and 70s. Its reputation is built on how quickly it adds size. This guide explains what it is, why it works, and the side effects that come with it.
A brief history
Dianabol was developed by the Swiss company Ciba and released in the United States in 1958. Dr John Ziegler, a physician working with the US weightlifting team, encouraged its development after learning that Soviet athletes were using testosterone. It was approved for some medical uses but was withdrawn from the US market in the 1980s. It has never been an approved drug in Canada.
How it works
Methandrostenolone is testosterone with two changes: a double bond that reduces its androgenic strength, and a methyl group at carbon 17 (17-alpha-alkylation) that stops the liver breaking it down when swallowed. That second change is what lets it work as a tablet, and also what makes it hard on the liver.
- Protein synthesis and nitrogen retention increase, supporting muscle growth.
- Glycogen storage in muscle rises, giving a fuller look and more training capacity.
- Water retention increases, partly through its conversion to methylestradiol, a strong estrogen.
Side effects
Liver
Raised liver enzymes are common. More serious problems include cholestasis (blocked bile flow, with jaundice and itching) and, with long-term use, peliosis hepatis (blood-filled cysts) and liver tumours. Alcohol, acetaminophen at high doses and other oral steroids add to the strain. Our guide to liver support during orals explains what helps and what does not.
Blood pressure and cholesterol
Dianabol can raise blood pressure within days, partly through water retention, and sharply lowers HDL cholesterol. Read steroids and cholesterol.
Estrogen effects
Bloating, puffiness and breast tissue growth (gynecomastia) are common. Early signs are a tender or itchy lump under the nipple. See estrogen management.
Other effects
- Acne and oily skin
- Hair loss in those prone to it
- Suppression of natural testosterone
- Mood changes and irritability
Common myths
- “Liver supplements make it safe.” Products like milk thistle or TUDCA have limited evidence and do not cancel the liver strain from a 17-alpha-alkylated steroid. Bloodwork is the only way to know how your liver is coping.
- “Taking it with food reduces liver strain.” Food may reduce stomach upset, but the drug still passes through the liver.
- “It is safe because it was a medicine.” Its former medical doses were small and short, and it was withdrawn partly because safer options exist.
- “More is better.” Side effects rise steeply with dose, while extra gains are mostly water.
Why gains shrink after stopping
Many people see several kilograms of weight gain in the first weeks. When Dianabol is stopped, water and glycogen fall away, so some of that weight disappears. The muscle that remains depends on training, food and recovery. Our article on realistic results gives honest expectations.
Bloodwork
- Liver enzymes: ALT, AST, GGT and bilirubin
- Lipid panel (HDL and LDL)
- Complete blood count
- Estradiol and testosterone
- Kidney function
- Blood pressure at home, ideally daily
Test before starting and within a few weeks of starting. In Canada, your doctor can order these, or you can pay privately at LifeLabs or Dynacare; see our bloodwork guide.
Dianabol with testosterone
Because Dianabol suppresses natural testosterone, it is commonly discussed alongside injectable testosterone rather than on its own. Our article on testosterone and Dianabol explains the reasoning and added risks, and Anadrol vs Dianabol compares it with its closest rival.
Products and legal status
We carry Zionova Dianabol and Genetix Dianabol 20 mg, each with batch lab results. Methandrostenolone is a Schedule IV controlled substance in Canada and is banned in sport.
Frequently asked questions
Is Dianabol hard on the liver?
Yes. It is 17-alpha-alkylated, which commonly raises liver enzymes and can cause cholestasis. Liver tests before and during use are important.
Why does Dianabol cause bloating?
It converts to methylestradiol, a potent estrogen, and increases glycogen storage, both of which hold water.
Do Dianabol gains last?
Some do. Water and glycogen are lost after stopping, so part of the weight goes, but muscle built through training can be kept.
Photo: Marcin Czaja, StockSnap (public domain).
General information, not medical advice. Methandrostenolone is not an approved drug in Canada and is a Schedule IV controlled substance.
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