Does splitting fluoxymesterone into more frequent doses keep levels steadier?

In the model, it narrows the swing but not the average. With the same total per week, the peak-to-trough ratio at steady state is about 2.12:1 every 0.5 days, about 5.04:1 daily. Which schedule to use is a decision for you and your prescriber.

Is this chart my actual fluoxymesterone level?

No. It is a modeled estimate from a published half-life, using the same one-compartment model as the Dose Track app. Real levels vary with body weight, food, kidney and liver function and other factors, and only a lab test measures them. It is not medical advice.

Fluoxymesterone Half-Life: Peak and Steady State Chart

Q: How long does fluoxymesterone take to reach steady state?

About 47.5 hours of regular dosing at the same amount and interval, which is 5 half-lives. With a half-life of about 9.5 hours, levels reach about 50% of steady state after 9.5 hours and about 90% after 31.6 hours. Changing the dose or interval starts a new climb toward a new steady state.

Q: How long does fluoxymesterone stay in your system after the last dose?

Roughly 5 half-lives, about 47.5 hours, until about 97% has cleared in the model. Half is gone about 9.5 hours after levels start falling. Real clearance varies from person to person, and a drug can still have effects after levels are low.

Short answer: Fluoxymesterone has a half-life of about 9.5 hours (Halotestin (fluoxymesterone) tablets label) and reaches steady state after about 47.5 hours of regular dosing. We could not confirm a published time to peak for fluoxymesterone, so we do not state one. With the same total per week, Dose Track's model gives a peak-to-trough swing of about 2.12:1 every 0.5 days and about 5.04:1 daily.

Daily vs every 0.5 days: how do fluoxymesterone levels compare?

The Halotestin label gives 5 to 20 mg daily for testosterone replacement in men, at once or in divided doses. The chart compares 10 mg once daily with 5 mg twice daily. Source: Halotestin (fluoxymesterone) tablets label. Bioavailability 80% as in the app. Dashed line: 5 half-lives. Change the amount or schedule in the calculator.

When does fluoxymesterone peak after a dose?

We could not confirm a published time to peak for fluoxymesterone, so we do not state one. The curve still needs a rise time, so it uses the app's modeling estimate; treat the shape of the first day or two as approximate.

How long does fluoxymesterone take to reach steady state?

With regular dosing at a fixed amount and interval, levels climb toward steady state by the same fraction every half-life, whatever the dose. At a half-life of about 9.5 hours:

Time from the first dose to each share of steady state, fluoxymesterone (half-life 9.5 hours).
Share of steady state	Half-lives	Time
50%	1	9.5 hours
75%	2	19 hours
90%	3.3	31.6 hours
97% (Dose Track's steady-state rule)	5	47.5 hours

How much do fluoxymesterone levels swing between doses?

The longer the gap between doses compared with the half-life, the bigger the swing from peak to trough and the less the levels build up. These ratios do not depend on the amount.

Steady-state peak:trough and build-up by dosing interval, fluoxymesterone, in Dose Track's model.
Interval	Peak : trough	Build-up vs one dose
Daily	5.04 : 1	1.21×
Every other day	28.9 : 1	1.03×
Twice weekly	399 : 1	1×
Weekly	over 1,000 : 1	1×
Every 2 weeks	over 1,000 : 1	1×

Build-up is the accumulation ratio 1 / (1 − e^−k·τ), with k = ln 2 / half-life and τ the interval.

How long does fluoxymesterone stay in your system?

After the last dose, about half is gone every 9.5 hours. After 5 half-lives, about 47.5 hours, roughly 97% has cleared in the model.

Where do these numbers come from?

The Halotestin label says the half-life of fluoxymesterone after a dose by mouth is about 9.2 hours; Dose Track uses 9.5 hours. The label gives no time to peak.

Halotestin (fluoxymesterone) tablets prescribing information (Pharmacia & Upjohn), May 2002. DailyMed.

The curve uses the half-life, time to peak, route and bioavailability built into the Dose Track app for fluoxymesterone, and the same one-compartment model with first-order absorption. These are modeled estimates from published half-lives, drawn with the same one-compartment model as the Dose Track app. Real levels vary from person to person, and only a lab test measures them. This is not medical advice and not a dosing recommendation; dosing decisions belong with you and your prescriber.

Vial sizes and syringe math are in the Fluoxymesterone guide.

When does fluoxymesterone peak and reach steady state?