Progestogen / hormone replacement
Progesterone half-life and pharmacokinetics
Half-life describes how long it takes plasma concentration of Progesterone to drop by half after a dose. It is the most useful single number for understanding why Progesterone (Progesterone) is dosed the way it is — once daily, on demand, or some other schedule. The 100mg, 200mg strengths and capsule formulation tune the curve.
Why half-life matters
Progesterone reaches peak plasma levels some hours after dosing, then decays. Short half-life agents are out of the system quickly and well-suited to event-driven dosing. Long half-life agents allow once-daily continuous coverage but accumulate over the first few days until reaching steady state. Progesterone binds to progesterone receptors and modulates gene expression in reproductive and other tissues.
Practical dose-pacing
According to the prescribing information for Progesterone, the dosing interval reflects the half-life and the desired duration of effect. Re-dosing inside the half-life window stacks plasma concentration without proportional benefit; spacing doses correctly keeps the steady-state where it is expected. The 100mg, 200mg options exist to allow personalised exposure within this framework.
Frequently asked questions
How long does Progesterone stay in your system? ▾
Most active drug clears within four to five half-lives. For Progesterone the exact half-life is in the prescribing information, but residual measurable drug may persist longer than the subjective effect at 100mg, 200mg.
Can Progesterone accumulate over time? ▾
Daily dosing of any drug accumulates until plasma concentrations reach steady state, typically within four to five half-lives. After that, Progesterone stays at predictable levels as long as the 100mg, 200mg dose is unchanged. This is by design and is not the same as harmful accumulation.
Products containing Progesterone
More on Progesterone
- With alcoholProgesterone and alcohol — is it safe to drink?
- With foodShould Progesterone be taken with food?
- Side effectsProgesterone side effects: common, rare and warning signs
- Dosage guideProgesterone dosage guide: how much to take and when
- OnsetHow fast does Progesterone start working?
- DurationHow long does Progesterone last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.