Drostanolone (Masteron): Legal Status & mg to mL
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Drostanolone: legal status and mg to mL math

Vial strengths · mg to mL · Units chart · Half-life notes

What is drostanolone?

Drostanolone (also called dromostanolone) is an injectable anabolic steroid, a 2-alpha-methyl derivative of dihydrotestosterone (DHT). It was once sold in the US as Masterone (drostanolone propionate), but that approval was withdrawn in 1997.

Also known as: Masteron, Masterone, Drostanolone propionate, Drostanolone enanthate, Dromostanolone.

Common strengths

There is no FDA-approved drostanolone product today, so there is no current label strength to quote. Check the strength printed on your vial; the math below uses 100 mg/mL only as an example. It is already a liquid, so there is nothing to mix.

Worked example: mg to mL and syringe units

Drostanolone is already a solution, so there is no mixing. The only math is turning an amount in mg into a volume. Here it is at 100 mg/mL for 50 mg.

  1. Volume to draw. 50 mg ÷ 100 mg/mL = 0.5 mL
  2. On a U-100 syringe. 0.5 mL × 100 = 50 units
The amount here is an example to show the math, not a recommendation. How much to take is a decision for you and your prescriber. Check the strength printed on your vial; the same amount is a different volume at a different strength.

Volume chart at 100 mg/mL

Amounts are examples for the conversion, not doses.
AmountVolumeU-100 syringe
25 mg0.25 mL25 units
50 mg0.5 mL50 units
75 mg0.75 mL75 units
100 mg1 mL100 units

Legal status and history

Hoffman-La Roche's Masterone (dromostanolone propionate, NDA 12-966) was one of several products whose approval FDA withdrew in 1997 after the companies said they were no longer marketed. Drostanolone propionate was studied as a breast cancer treatment (for example, Seay 1972).

Anabolic steroids are Schedule III controlled substances in the US, and this one is named in the federal list (21 CFR 1308.13(f)). Having it without a valid prescription is illegal. It is on the World Anti-Doping Agency (WADA) Prohibited List as an anabolic agent, banned in and out of competition. In two excretion studies run by an anti-doping lab (Albertsdóttir 2020), a drostanolone metabolite was detected in urine for up to 29 days.

There is no FDA label for people, so there are no label warnings to quote; the harms below are the ones the cited studies report. We found no recent human trial of drostanolone that we could cite for its effects.

Dose Track has drostanolone propionate and drostanolone enanthate as separate built-in compounds, so you can log whichever ester is on your vial.

Drostanolone half-life and time to peak

  • Half-lifeNot listed
  • Time to peak (Tmax)Not listed
  • Route in Dose TrackInto muscle (intramuscular)

We found no published study that measured drostanolone propionate or enanthate levels in people, so we do not list the app's modeling values (2 days and 24 hours for the propionate, 7 days and 48 hours for the enanthate).

How to track drostanolone in Dose Track

  1. Add drostanolone from the built-in list. It sits next to everything else you take, so a GLP-1, TRT and a few peptides all live in one log.
  2. Save the vial strength (for example 100 mg/mL). Every amount you log then shows in mL and syringe units.
  3. Log each shot. The app subtracts it from the vial, shows what is left, and warns you before you run out.
  4. Set reminders on your own schedule, whether that is daily, weekly or every few days.
  5. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

How Dose Track handles peptides · Reconstitution calculator · Half-life calculator

Methenolone EnanthateMetenolone, Primobolan TrenboloneTrenbolone acetate, Trenbolone enanthate Testosterone PropionateTest P · half-life about 20 hours

Frequently asked questions

How many mL is 50 mg of drostanolone?+
Divide the amount by the strength on the vial. At 100 mg/mL, 50 mg is 0.5 mL. At a different strength the volume changes, so always check the label. The amount is only an example for the math, not a recommendation.
How many units on an insulin syringe is 50 mg of drostanolone?+
On a U-100 insulin syringe, 1 mL is 100 units. At 100 mg/mL, 50 mg is 0.5 mL, which is 50 units. Multiply the mL by 100 to get units.
What is the half-life of drostanolone?+
We found no published study that measured drostanolone propionate or enanthate levels in people, so we do not list the app's modeling values (2 days and 24 hours for the propionate, 7 days and 48 hours for the enanthate).
Is drostanolone (Masteron) FDA approved?+
Not any more. FDA withdrew approval of Masterone (dromostanolone propionate) in 1997 after the maker said it was no longer marketed. Drostanolone is a Schedule III controlled substance in the US.
How long is drostanolone detectable?+
In two excretion studies by an anti-doping lab (Albertsdóttir 2020), the main drostanolone metabolite was detected in urine for up to 29 days.
Can I track drostanolone in Dose Track?+
Yes. Drostanolone is built into Dose Track. You can log each shot next to your other compounds, save the vial strength so every amount shows in mL and syringe units, see how much is left in the vial, and get reminders. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

Sources

  1. FDA. Hoffman-La Roche, Inc., et al.; withdrawal of approval of 11 new drug applications (includes Masterone, dromostanolone propionate, NDA 12-966). Federal Register, January 9, 1997.
  2. Seay DG, Bradshaw JD, Nicol NT. Clinical experience with dromostanolone propionate (NSC-12198) in breast carcinoma. Cancer Chemother Rep. 1972;56(1):89-92.
  3. Albertsdóttir AD, et al. Searching for new long-term urinary metabolites of metenolone and drostanolone using gas chromatography-mass spectrometry with a focus on non-hydrolysed sulfates. Drug Test Anal. 2020;12(8):1041-1053.
  4. 21 CFR 1308.13(f): Schedule III anabolic steroids. eCFR, October 2026.
  5. World Anti-Doping Agency. 2026 Prohibited List, S1 Anabolic agents.

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